Windows Update failed error code: 800F0900


  1. Pickupman66
    Posts : 5
    Windows 7 32 bit
       New #1

    Windows Update failed error code: 800F0900


    Hoping someone can help me here. I have seen Noel DP post several resolutions but each seem custom to the errors the other user gets.

    I ran SFC/Scannow with no errors. Ran Checksur and got errors.

    Unavailable repair files:
    servicing\packages\WUClient-SelfUpdate-Core-TopLevel~31bf3856ad364e35~x86~~7.6.7600.320.mum
    servicing\packages\WUClient-SelfUpdate-Core-TopLevel~31bf3856ad364e35~x86~~7.6.7600.320.mum
    servicing\packages\WUClient-SelfUpdate-Core-TopLevel~31bf3856ad364e35~x86~~7.6.7600.320.cat
    servicing\packages\WUClient-SelfUpdate-Core-TopLevel~31bf3856ad364e35~x86~~7.6.7600.320.cat

    CBS log and CheckSUR Log attached.
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  3. matts6887
    Posts : 1,449
    Windows 7 ultimate 64-bit
       New #2

    This sounds to me like you may have to try going in and deleting the windows update catalog files and re running windows update and see what happens. If that doesnt solve the issue post back and we can take it from there.
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  4. Pickupman66
    Posts : 5
    Windows 7 32 bit
    Thread Starter
       New #3

    when running windows update it states there is an update for windows update and that it needs to restart. it then crashes and fails with this error code. how do you remove the catalog files from Windows update?

    Incidentally I searched several areas and saw resolutions here that Noel NP posted for other people.
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  6. matts6887
    Posts : 1,449
    Windows 7 ultimate 64-bit
       New #4

    try the steps in the following link:

    Windows Update - Reset
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  7. Pickupman66
    Posts : 5
    Windows 7 32 bit
    Thread Starter
       New #5

    Already done that. Same issue.
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  8. NoelDP
    Posts : 21,482
    Win 7 x64 Home Premium (and x86 VirtualBox VM)/Win10
       New #6

    NOTHING will fix the problem except properly replacing the missing files - I'll post a protocol later.
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  10. NoelDP
    Posts : 21,482
    Win 7 x64 Home Premium (and x86 VirtualBox VM)/Win10
       New #7

    I've uploaded a file - p66aa.zip - to my OneDrive at Noel's OneDrive
    Please download and save it.
    Right-click on the downloaded file, and select Extract all…
    Extract to the default location - which will create a new folder p66aa in the same place.
    Open this folder - there should be one folder inside it (Packages)

    Copy the content of the Packages folder to the folder
    C:\Windows\Temp\CheckSur\Servicing\Packages


    Now run the CheckSUR tool again (it may take a while)

    Post the new CheckSUR.log file, and the CheckSUR.persist.log file.
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  11. Pickupman66
    Posts : 5
    Windows 7 32 bit
    Thread Starter
       New #8

    Thank you


    Thank you, I have downloaded the protocol and am running Checksur now. will report back in a few hours after I get done with other family duties.
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  12. Pickupman66
    Posts : 5
    Windows 7 32 bit
    Thread Starter
       New #9

    Fixed the issue.

    thank you so very much. too bad this has to be a custom fix for so many.
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  13. NoelDP
    Posts : 21,482
    Win 7 x64 Home Premium (and x86 VirtualBox VM)/Win10
       New #10

    CheckSUR itself is the general fix - people like me are left to deal with the stuff that it can't fix. Mostly it gets around 90% of such errors, missing the later or rarer ones - or it'd end up being the same size as Windows itself!
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