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Thread: problem connecting windows update - CPU 100% svchost.exe

  1. #1
    Rollo Guest

    problem connecting windows update - CPU 100% svchost.exe


    everythime I try to connect to winduws update, no list of item can be
    displayed. The browser stays in "hang status", the svchost process arrives to
    100% CPU until it blocks everything. No error reported.

    I tried several workaround (deleting software distribution folder, stopping
    the firewall). But nothing worked until now! THe connection looks fine. The
    service for windowsupdate is correctly running. I really cannot understand.
    Anybody who can help, please?

  2. #2
    Ottmar Freudenberger Guest
    If you want to have it resolved now (and not wait another ~4 weeks):
    Download and install KB927891 (v2) links to be found for your Windows
    version in

    After you've installed that one, download an install the actual version
    of Windows Update Agent 3.0 via

    I'm assuming you're *not* running Windows Vista and no 64bit version
    of any Windows.

  3. #3
    sean Guest
    I think so.

    I'm in the same boat as well with Vista.

    My computer will not update anything from Microsoft.

    It quit updating about a month ago after updating fine on a regular basis.

    Nobody seems to know how to fix it.

    I have tried everything I could find on the internet and it still will not
    search for updates.

  4. #4
    Weezul Guest

    KB 927891 not working

    We have been having on ongoing problem with this svchost.exe process related
    to Microsoft auto updater. I have tried applying the 927891 patch each time,
    and it has resolved the problem on several. However, the last three pcs that
    I have worked on that have had this issue would not run free up after
    applying it. I have had to tell the users that they will need to run updates
    manually for now, and am becoming quite annoyed with this issue. If you
    reference the KB article, the end results that they are trying to achieve do
    not look promising to begin with. This being a main component of Windows, I
    would think they would have this resolved ASAP, but it is still an issue for
    us four months later.

  5. #5
    Ottmar Freudenberger Guest

    Re: KB 927891 not working

    And Windows Update Agnet 3.0 has been installed too? *Both*, KB927891
    *and* WUA 3.0 are needed to fix the svchost permanent 100% CPU usage
    in conjunction with wuauclt.exe running.

    Are there any Personal Firewall applications installed on these
    machines and/or any design changing "Vista Packs" and the like?
    Did you try running "netsh winsock reset" under "Run" in the Start
    menu and rebooted the machine? Did that help at least temporary?

  6. #6
    Chuck Guest

    Re: problem connecting windows update - CPU 100% svchost.exe

    Abruptly on Thursday (5/8/2008) my wife's laptop, a 16 month-old dual-core
    ThinkPad with XP SP2, began an extended run at 100% CPU like many of the
    other incidents described in this article, most notably that of MoosieAZ. I
    traced the problem to an instance of the svchost.exe process and am dismayed
    to report that it finally retired into the background after 47 minutes of CPU
    time. Further, it executed several hundred BILLION I/O Read Bytes. Yep,
    MINUTES and BILLIONS. I can't possibly imagine what operation could consume
    such resources and still run to apparent completion. Seems like a process
    that asks "Are these few/dozen/hundreds DLLs up to date?" should be able to
    answer that question in a mere fraction of the time . . . and resources.

    This behavior repeated itself everytime she restarted the laptop. (This
    occurs frequently, since her habit is to turn off the machine when she's
    done with any usage session. I realize some pain could be avoided by leaving
    the laptop running, but that's not the point.) After several 47 minute
    cycles on subsequent start-ups, the computer seemed to have been happy with
    the work it performed and, per the System Event Log, indicated that about a
    dozen Office 2003 updates were SCHEDULED for installation at 3:00 a.m. on
    5/10/2008. Most of the updates seemed to be security related.

    We left the laptop on over night so it could plow through the 3:00 a.m.
    installation, which logs indicate it accomplished successfully, though I have
    no CPU or I/O stats to report.

    I thought we were clear of the problem, but the same 100% CPU behavior began
    again this morning (Sunday, 5/11/2008). Armed with a little more knowledge
    of the potential culprit, I was able to confirm that a svchost.exe instance
    was indeed racking up the CPU and I/O, the former of which rivaled the System
    Idle Process. From Process Explorer (procexp.exe) I confirmed that
    'wuauserv' was a member of the svchost instance and was able to successfully
    kill 'wuauserv'. The system recovered in a matter of seconds and the
    computer returned to its normal responsiveness.

    I can confirm that KB 927891 was delivered on 5/23/2007, not too long after
    the initial post on this thread and presumably as a result of Windows Update
    performing properly. I'm not certain whether it was successfully installed,
    though. The KB927891.log file indicates fourteen files were copied, but the
    log also contains twenty consecutive lines of "KB927891 encountered an error:
    The update.ver file is not correct." near the beginning and scattered other
    "failure" messages throughout.

    Regarding any updating of Windows Update Agent to 3.0, I can only report the
    dates and internal versions of the following "wuau..." files in

    wuauclt.exe 07/30/2007 07:19 PM 7.0.6000.381
    wuauclt1.exe 05/26/2005 08:16 AM built by:
    wuaueng.dll 07/30/2007 07:19 PM 7.0.6000.381
    wuaueng1.dll 05/26/2005 08:16 AM built by:
    wuauserv.dll 08/04/2004 08:00 AM 5.4.3790.2180

    I present this information in as much detail as I can muster because it
    seems our symptoms align well with described problem, but it disturbs me that
    most of the posts on this thread date back to May 2007. I would have
    expected that Microsoft would have resolved the problem in less that twelve
    months. The laptop has been on Automatic Updates since shortly after we
    received it, although I only installed Office 2003 on it a few weeks ago.

    I am reluctant to proceed with the (re?)installation of KB 927891 and update
    to Windows Update Agent 3.0 described earlier because it seems like it is old
    guidance. How do we get this problem resolved?

  7. #7
    shayward Guest

    Re: problem connecting windows update - CPU 100% svchost.exe

    This is happening to me as well - and it just started in the middle of last
    week. Automatic Updates is the offender - I disabled it in MSCONFIG and all
    is well (other than the fact that Automatic Updates is disabled).

    SVCHOST consumes 100% CPU and it starts eating memory until it reaches >

  8. #8
    Antony Scerri Guest

    Re: problem connecting windows update - CPU 100% svchost.exe

    I think im in the same boat here with a laptop which after an update on 19th
    May (WAU had been disabled since april time so hadnt run or been used) is now
    going 100% CPU usage during update scans.

    Its tied to another issue my machine is now experiencing, which happened on
    my last laptop after it too hit the 100% CPU during the update process when
    the problem first arose prior to Update agent 3.0 being released around a
    year ago. Both machines now keep hitting the disk every second even when
    nothing is running and im not using the machine, with periods of the machines
    fans kicking in even when Task Manager shows no apparent CPU usage. Any small
    spike in CPU usage also causes the fan to kick in where it used to wait a
    while unless it was 100% usage for a shorter period would cause it to kick
    in. For anyone interested my other post is -

    So im interested in any conclusions people come to.


  9. #9
    MoosieAZ Guest
    From posts in various groups across the net, and from personal experience, I
    think this problem has run it's course. It appears that starting on May 7th
    (give or take a day) the contents of the C:\Windows\SoftwareDistribution
    folder, the Windows Update service, and the CA AntiVirus real-time scanner
    (engine 31.4) collided.

    Excluding installer file types from A/V scans, or snoozing the A/V, or
    deleting/renaming the C:\Windows\SoftwareDistribution, OR a combination of
    these tricks did seem to resolve the issue. Then about a week after it all
    began, CA released engine 31.5 via their automatic update and life has
    returned back to whatever the hell is normal.

    P.S. Make sure you remove any exclusions for CA A/V that you may have
    implemented as a circumvention.

  10. #10
    airlok Guest

    Re: problem connecting windows update - CPU 100% svchost.exe

    Hello, I know this post is old but we started to have the exact same issue
    Chuck discribe and I am disapointed to se that their is not a resolution on
    this or that I have not found one yet. THis is an issue we are having on
    over 10 Windows XP PRO SP3 all up do date pc's . As soon as we disable
    Windows update all workes well. But in my opinion this is not a solution. It
    is a temporarely fix.

    Does anyone have this issue still and is their a resent solution we tried
    everything on this post and other post to no avail.

  11. #11
    MowGreen Guest

    Re: problem connecting windows update - CPU 100% svchost.exe

    What post ?

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