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code 800F0900 Windows update encountered an unknown error

Windows Update


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  #1  
Old 07-02-2009
SpikeyBill
 
Posts: n/a
code 800F0900 Windows update encountered an unknown error

Hi, I have vista ultimate, zone alarm firewall, avg anti virus, windows
defender. The laptop came with a trial version of mcafee, which i have
uninstalled several months ago. Since 19/12/2008 windows updates have failed
with the above error. I have run chkdsk, disk cleanup, but cannot resolve
this issue. Please can you assist?

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  #2  
Old 07-02-2009
PA Bear [MS MVP]
 
Posts: n/a
1. Do Step #2 of this three-step-fix then reboot:
http://service.mcafee.com/FAQDocument.aspx?id=TS100507

2. If no joy, review these previous discussions:

AU Check was withdrawn months ago. Check other threads in that link,
please.
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  #3  
Old 08-02-2009
SpikeyBill
 
Posts: n/a
Re: code 800F0900 Windows update encountered an unknown error

thanks, i've removed mcafee using the removal tool, but still have the error.
I've seen the previous thread for AU Check (v78a)
<http://www.codeplex.com/aureset/Release/ProjectReleases.aspx?ReleaseI...>
but the link does not exist anymore ???. I'm still stuck. Can i get the AU
check exe from another location?
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  #4  
Old 24-09-2009
Member
 
Join Date: Sep 2009
Posts: 1
Re: code 800F0900 Windows update encountered an unknown error

hi all

I apparently got rid of the 800F0900 error on my Vista Home Basic by installing Microsoft's System Update Readiness Tool (KB947821) - http://support.microsoft.com/kb/947821

for months, many updates gave me that error, but after installing KB947821, SP2 installation succeeded at first try.

best hopes
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