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Thread: C000021A unknown hard error

  1. #1
    bigboy Guest

    C000021A unknown hard error

    dear all,

    I am using WinXP pro /sp2 and automatic update enabled.
    Yesterday, my pc suddently can't load to login screen, after xp logo and the
    running status bar, blue screen show with
    "C000021A unknown hard error" is shown in the top left corner of the screen.
    I try to use the winxp cd to repair, it can load the login screen again even
    can login and work fine but become winxp pro with sp1 and without all the
    updates. Then I update to sp2, it said fail during upgrade. but after
    reboot, winver show me is winxp pro with sp2, then I keep update, it require
    me to update about 63 items, after updated and reboot, the blue screen come
    again with the same error message.

    what can i do ??? i have no other spare parts to find out which hardware has
    error, I try to install the winxp again in a new harddisk, i work fine
    before update, but after update, required reboot but the pc enter a loop, it
    reboot and reboot, can't load the login screen again. it seem is not the
    harddisk error.

    please give me some advice to solve this. thanks you very much ^_^




  2. #2
    J Barker Guest

    RE: C000021A unknown hard error

    Sounds like you're having exactly the same problem I am.

    You need to boot your machine using the Windows XP CD and select the
    Recovery Console option.

    When you get to the C:\WINDOWS prompt you'll need to type:

    cd $NtUninstallKB925902$\spuninst
    batch spuninst.txt

    This will undo the KB925902 update and copy the original files back.

    Next, make sure the machine hasn't got a live network connection to stop it
    going and reinstalling the update.

    Type 'exit' at the recovery console prompt and hopefully it will reboot.

    You can then go to Control Panel and switch of Automatic Updates for now.
    Also, go to Add/Remove Programs, click the 'Show Updates' box at the top and
    remove the KB925902 update completely. Then you can restore your network
    connection.

    This is only a temporary fix as you still don't have this security update
    and will have to check for subsequent updates manually, but it worked for me
    - hope it gets you going again.

  3. #3
    J Barker Guest

    RE: C000021A unknown hard error

    Sounds like you're having exactly the same problem I am.

    You need to boot your machine using the Windows XP CD and select the
    Recovery Console option.

    When you get to the C:\WINDOWS prompt you'll need to type:

    cd $NtUninstallKB925902$\spuninst
    batch spuninst.txt

    This will undo the KB925902 update and copy the original files back.

    Next, make sure the machine hasn't got a live network connection to stop it
    going and reinstalling the update.

    Type 'exit' at the recovery console prompt and hopefully it will reboot.

    You can then go to Control Panel and switch of Automatic Updates for now.
    Also, go to Add/Remove Programs, click the 'Show Updates' box at the top and
    remove the KB925902 update completely. Then you can restore your network
    connection.

    This is only a temporary fix as you still don't have this security update
    and will have to check for subsequent updates manually, but it worked for me
    - hope it gets you going again.

  4. #4
    J Barker Guest

    RE: C000021A unknown hard error

    Sounds like you're having exactly the same problem I am.

    You need to boot your machine using the Windows XP CD and select the
    Recovery Console option.

    When you get to the C:\WINDOWS prompt you'll need to type:

    cd $NtUninstallKB925902$\spuninst
    batch spuninst.txt

    This will undo the KB925902 update and copy the original files back.

    Next, make sure the machine hasn't got a live network connection to stop it
    going and reinstalling the update.

    Type 'exit' at the recovery console prompt and hopefully it will reboot.

    You can then go to Control Panel and switch of Automatic Updates for now.
    Also, go to Add/Remove Programs, click the 'Show Updates' box at the top and
    remove the KB925902 update completely. Then you can restore your network
    connection.

    This is only a temporary fix as you still don't have this security update
    and will have to check for subsequent updates manually, but it worked for me
    - hope it gets you going again.

  5. #5
    bigboy Guest

    Re: C000021A unknown hard error

    Thx J Barker ^_^

    I will try later....cause I didn't install any update now....
    but I check the new harddisk(which use I said before) in safe mode, I can't
    find K925902 ....
    so, what happen to the new harddisk ??? I just install the winxp sp1, then
    mother board driver(sound, lan, chipset), then automatic update....however,
    after reboot, it reboot, reboot and reboot again ............. may be beside
    K925902, there are some other update which cause this problem....what happen
    to microsoft.......help


    "J Barker" <JBarker@discussions.microsoft.com> 级糶秎ン穝籇:2F9FFC7E-DFB6-47A8-9049-D44E0FCB53C8@microsoft.com...
    > Sounds like you're having exactly the same problem I am.
    >
    > You need to boot your machine using the Windows XP CD and select the
    > Recovery Console option.
    >
    > When you get to the C:\WINDOWS prompt you'll need to type:
    >
    > cd $NtUninstallKB925902$\spuninst
    > batch spuninst.txt
    >
    > This will undo the KB925902 update and copy the original files back.
    >
    > Next, make sure the machine hasn't got a live network connection to stop
    > it
    > going and reinstalling the update.
    >
    > Type 'exit' at the recovery console prompt and hopefully it will reboot.
    >
    > You can then go to Control Panel and switch of Automatic Updates for now.
    > Also, go to Add/Remove Programs, click the 'Show Updates' box at the top
    > and
    > remove the KB925902 update completely. Then you can restore your network
    > connection.
    >
    > This is only a temporary fix as you still don't have this security update
    > and will have to check for subsequent updates manually, but it worked for
    > me
    > - hope it gets you going again.




  6. #6
    bigboy Guest

    Re: C000021A unknown hard error

    Thx J Barker ^_^

    I will try later....cause I didn't install any update now....
    but I check the new harddisk(which use I said before) in safe mode, I can't
    find K925902 ....
    so, what happen to the new harddisk ??? I just install the winxp sp1, then
    mother board driver(sound, lan, chipset), then automatic update....however,
    after reboot, it reboot, reboot and reboot again ............. may be beside
    K925902, there are some other update which cause this problem....what happen
    to microsoft.......help


    "J Barker" <JBarker@discussions.microsoft.com> 级糶秎ン穝籇:2F9FFC7E-DFB6-47A8-9049-D44E0FCB53C8@microsoft.com...
    > Sounds like you're having exactly the same problem I am.
    >
    > You need to boot your machine using the Windows XP CD and select the
    > Recovery Console option.
    >
    > When you get to the C:\WINDOWS prompt you'll need to type:
    >
    > cd $NtUninstallKB925902$\spuninst
    > batch spuninst.txt
    >
    > This will undo the KB925902 update and copy the original files back.
    >
    > Next, make sure the machine hasn't got a live network connection to stop
    > it
    > going and reinstalling the update.
    >
    > Type 'exit' at the recovery console prompt and hopefully it will reboot.
    >
    > You can then go to Control Panel and switch of Automatic Updates for now.
    > Also, go to Add/Remove Programs, click the 'Show Updates' box at the top
    > and
    > remove the KB925902 update completely. Then you can restore your network
    > connection.
    >
    > This is only a temporary fix as you still don't have this security update
    > and will have to check for subsequent updates manually, but it worked for
    > me
    > - hope it gets you going again.




  7. #7
    bigboy Guest

    Re: C000021A unknown hard error

    Thx J Barker ^_^

    I will try later....cause I didn't install any update now....
    but I check the new harddisk(which use I said before) in safe mode, I can't
    find K925902 ....
    so, what happen to the new harddisk ??? I just install the winxp sp1, then
    mother board driver(sound, lan, chipset), then automatic update....however,
    after reboot, it reboot, reboot and reboot again ............. may be beside
    K925902, there are some other update which cause this problem....what happen
    to microsoft.......help


    "J Barker" <JBarker@discussions.microsoft.com> 级糶秎ン穝籇:2F9FFC7E-DFB6-47A8-9049-D44E0FCB53C8@microsoft.com...
    > Sounds like you're having exactly the same problem I am.
    >
    > You need to boot your machine using the Windows XP CD and select the
    > Recovery Console option.
    >
    > When you get to the C:\WINDOWS prompt you'll need to type:
    >
    > cd $NtUninstallKB925902$\spuninst
    > batch spuninst.txt
    >
    > This will undo the KB925902 update and copy the original files back.
    >
    > Next, make sure the machine hasn't got a live network connection to stop
    > it
    > going and reinstalling the update.
    >
    > Type 'exit' at the recovery console prompt and hopefully it will reboot.
    >
    > You can then go to Control Panel and switch of Automatic Updates for now.
    > Also, go to Add/Remove Programs, click the 'Show Updates' box at the top
    > and
    > remove the KB925902 update completely. Then you can restore your network
    > connection.
    >
    > This is only a temporary fix as you still don't have this security update
    > and will have to check for subsequent updates manually, but it worked for
    > me
    > - hope it gets you going again.




  8. #8
    jrutz Guest

    Re: C000021A unknown hard error

    I had the same issues, To finally get the update installed (after getting
    your computer back to where it'll come up and get on the internet), I
    manually downloaded the update (KB925902) from MS, saved it to my hard drive,
    then restarted the computer in Safe Mode (F8 during the boot). Then Start
    Button -> Run, and Browse to the saved update file and run it.

    Once this was done everything was back to normal.

    Good luck - jrutz

    "bigboy" wrote:

    > Thx J Barker ^_^
    >
    > I will try later....cause I didn't install any update now....
    > but I check the new harddisk(which use I said before) in safe mode, I can't
    > find K925902 ....
    > so, what happen to the new harddisk ??? I just install the winxp sp1, then
    > mother board driver(sound, lan, chipset), then automatic update....however,
    > after reboot, it reboot, reboot and reboot again ............. may be beside
    > K925902, there are some other update which cause this problem....what happen
    > to microsoft.......help
    >
    >
    > "J Barker" <JBarker@discussions.microsoft.com> 录露录g漏贸露l楼贸路s禄D:2F9FFC7E-DFB6-47A8-9049-D44E0FCB53C8@microsoft.com...
    > > Sounds like you're having exactly the same problem I am.
    > >
    > > You need to boot your machine using the Windows XP CD and select the
    > > Recovery Console option.
    > >
    > > When you get to the C:\WINDOWS prompt you'll need to type:
    > >
    > > cd $NtUninstallKB925902$\spuninst
    > > batch spuninst.txt
    > >
    > > This will undo the KB925902 update and copy the original files back.
    > >
    > > Next, make sure the machine hasn't got a live network connection to stop
    > > it
    > > going and reinstalling the update.
    > >
    > > Type 'exit' at the recovery console prompt and hopefully it will reboot.
    > >
    > > You can then go to Control Panel and switch of Automatic Updates for now.
    > > Also, go to Add/Remove Programs, click the 'Show Updates' box at the top
    > > and
    > > remove the KB925902 update completely. Then you can restore your network
    > > connection.
    > >
    > > This is only a temporary fix as you still don't have this security update
    > > and will have to check for subsequent updates manually, but it worked for
    > > me
    > > - hope it gets you going again.

    >
    >
    >


  9. #9
    jrutz Guest

    Re: C000021A unknown hard error

    I had the same issues, To finally get the update installed (after getting
    your computer back to where it'll come up and get on the internet), I
    manually downloaded the update (KB925902) from MS, saved it to my hard drive,
    then restarted the computer in Safe Mode (F8 during the boot). Then Start
    Button -> Run, and Browse to the saved update file and run it.

    Once this was done everything was back to normal.

    Good luck - jrutz

    "bigboy" wrote:

    > Thx J Barker ^_^
    >
    > I will try later....cause I didn't install any update now....
    > but I check the new harddisk(which use I said before) in safe mode, I can't
    > find K925902 ....
    > so, what happen to the new harddisk ??? I just install the winxp sp1, then
    > mother board driver(sound, lan, chipset), then automatic update....however,
    > after reboot, it reboot, reboot and reboot again ............. may be beside
    > K925902, there are some other update which cause this problem....what happen
    > to microsoft.......help
    >
    >
    > "J Barker" <JBarker@discussions.microsoft.com> 录露录g漏贸露l楼贸路s禄D:2F9FFC7E-DFB6-47A8-9049-D44E0FCB53C8@microsoft.com...
    > > Sounds like you're having exactly the same problem I am.
    > >
    > > You need to boot your machine using the Windows XP CD and select the
    > > Recovery Console option.
    > >
    > > When you get to the C:\WINDOWS prompt you'll need to type:
    > >
    > > cd $NtUninstallKB925902$\spuninst
    > > batch spuninst.txt
    > >
    > > This will undo the KB925902 update and copy the original files back.
    > >
    > > Next, make sure the machine hasn't got a live network connection to stop
    > > it
    > > going and reinstalling the update.
    > >
    > > Type 'exit' at the recovery console prompt and hopefully it will reboot.
    > >
    > > You can then go to Control Panel and switch of Automatic Updates for now.
    > > Also, go to Add/Remove Programs, click the 'Show Updates' box at the top
    > > and
    > > remove the KB925902 update completely. Then you can restore your network
    > > connection.
    > >
    > > This is only a temporary fix as you still don't have this security update
    > > and will have to check for subsequent updates manually, but it worked for
    > > me
    > > - hope it gets you going again.

    >
    >
    >


  10. #10
    jrutz Guest

    Re: C000021A unknown hard error

    I had the same issues, To finally get the update installed (after getting
    your computer back to where it'll come up and get on the internet), I
    manually downloaded the update (KB925902) from MS, saved it to my hard drive,
    then restarted the computer in Safe Mode (F8 during the boot). Then Start
    Button -> Run, and Browse to the saved update file and run it.

    Once this was done everything was back to normal.

    Good luck - jrutz

    "bigboy" wrote:

    > Thx J Barker ^_^
    >
    > I will try later....cause I didn't install any update now....
    > but I check the new harddisk(which use I said before) in safe mode, I can't
    > find K925902 ....
    > so, what happen to the new harddisk ??? I just install the winxp sp1, then
    > mother board driver(sound, lan, chipset), then automatic update....however,
    > after reboot, it reboot, reboot and reboot again ............. may be beside
    > K925902, there are some other update which cause this problem....what happen
    > to microsoft.......help
    >
    >
    > "J Barker" <JBarker@discussions.microsoft.com> 录露录g漏贸露l楼贸路s禄D:2F9FFC7E-DFB6-47A8-9049-D44E0FCB53C8@microsoft.com...
    > > Sounds like you're having exactly the same problem I am.
    > >
    > > You need to boot your machine using the Windows XP CD and select the
    > > Recovery Console option.
    > >
    > > When you get to the C:\WINDOWS prompt you'll need to type:
    > >
    > > cd $NtUninstallKB925902$\spuninst
    > > batch spuninst.txt
    > >
    > > This will undo the KB925902 update and copy the original files back.
    > >
    > > Next, make sure the machine hasn't got a live network connection to stop
    > > it
    > > going and reinstalling the update.
    > >
    > > Type 'exit' at the recovery console prompt and hopefully it will reboot.
    > >
    > > You can then go to Control Panel and switch of Automatic Updates for now.
    > > Also, go to Add/Remove Programs, click the 'Show Updates' box at the top
    > > and
    > > remove the KB925902 update completely. Then you can restore your network
    > > connection.
    > >
    > > This is only a temporary fix as you still don't have this security update
    > > and will have to check for subsequent updates manually, but it worked for
    > > me
    > > - hope it gets you going again.

    >
    >
    >


  11. #11
    J Barker Guest

    Re: C000021A unknown hard error



    "jrutz" wrote:

    > I had the same issues, To finally get the update installed (after getting
    > your computer back to where it'll come up and get on the internet), I
    > manually downloaded the update (KB925902) from MS, saved it to my hard drive,
    > then restarted the computer in Safe Mode (F8 during the boot). Then Start
    > Button -> Run, and Browse to the saved update file and run it.
    >
    > Once this was done everything was back to normal.
    >
    > Good luck - jrutz


    Thanks, jrutz. I've just tried your suggestion and I now have a PC with
    KB925902 installed which still boots! I can only assume that, with the PC
    running 'normally', some process was stopping the update installing properly
    and causing the subsequent boot failure. Booting in Safe Mode has,
    presumably, allowed the update to go in properly and prevent the problem.

    I also run AVG Free and that seems fine, although I did install the
    additional Realtek HD Audio hotfix as advised on the AVG website.

    Hooray, now I can get on with my Easter holiday.

    JB

  12. #12
    J Barker Guest

    Re: C000021A unknown hard error



    "jrutz" wrote:

    > I had the same issues, To finally get the update installed (after getting
    > your computer back to where it'll come up and get on the internet), I
    > manually downloaded the update (KB925902) from MS, saved it to my hard drive,
    > then restarted the computer in Safe Mode (F8 during the boot). Then Start
    > Button -> Run, and Browse to the saved update file and run it.
    >
    > Once this was done everything was back to normal.
    >
    > Good luck - jrutz


    Thanks, jrutz. I've just tried your suggestion and I now have a PC with
    KB925902 installed which still boots! I can only assume that, with the PC
    running 'normally', some process was stopping the update installing properly
    and causing the subsequent boot failure. Booting in Safe Mode has,
    presumably, allowed the update to go in properly and prevent the problem.

    I also run AVG Free and that seems fine, although I did install the
    additional Realtek HD Audio hotfix as advised on the AVG website.

    Hooray, now I can get on with my Easter holiday.

    JB

  13. #13
    J Barker Guest

    Re: C000021A unknown hard error



    "jrutz" wrote:

    > I had the same issues, To finally get the update installed (after getting
    > your computer back to where it'll come up and get on the internet), I
    > manually downloaded the update (KB925902) from MS, saved it to my hard drive,
    > then restarted the computer in Safe Mode (F8 during the boot). Then Start
    > Button -> Run, and Browse to the saved update file and run it.
    >
    > Once this was done everything was back to normal.
    >
    > Good luck - jrutz


    Thanks, jrutz. I've just tried your suggestion and I now have a PC with
    KB925902 installed which still boots! I can only assume that, with the PC
    running 'normally', some process was stopping the update installing properly
    and causing the subsequent boot failure. Booting in Safe Mode has,
    presumably, allowed the update to go in properly and prevent the problem.

    I also run AVG Free and that seems fine, although I did install the
    additional Realtek HD Audio hotfix as advised on the AVG website.

    Hooray, now I can get on with my Easter holiday.

    JB

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