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Thread: code 800F0900 Windows update encountered an unknown error

  1. #1
    SpikeyBill Guest

    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?

  2. #2
    PA Bear [MS MVP] Guest
    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    AU Check was withdrawn months ago.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.

  3. #3
    SpikeyBill Guest

    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?

  4. #4
    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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