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As I try to move from IE9 per-release to the regular IE9 I get the mostly useless error 800B0100

sfc completed without error.

Using firegenUL I find the most common error to read

HANDLER FATAL: UH: 0x800b0100: EvaluateApplicability failed in CCbs::EvaluateApplicability

System update readiness tool gives me Checking Packages (f) CBS MUM Missing 0x00000002 servicing\Packages\Microsoft-Windows-PowerShell-ISE-Package~31bf3856ad364e35~x86~~7.0.6002.18181.mum
(f) CBS MUM Missing 0x00000002 servicing\Packages\Microsoft-Windows-PowerShell-WTR-Package~31bf3856ad364e35~x86~~7.0.6002.18181.mum

I tried to uninstall IE9 from command line as it doesn't show in installed updates. Failed.

Any other suggestions?

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Have you tried to install PowerShell, as the error message states it's not there? – user3463 Aug 23 '12 at 3:35
    
I did try that - says its not applicable to my system (powershell 1 or 2). I cant see it in list of installed updates so I went into system32 and renamed WindowsPowerShell folder and that made no difference.... – user153987 Aug 23 '12 at 11:05
    
How hard did you try? support.microsoft.com/kb/968929 – user3463 Aug 23 '12 at 15:22
    
This update does not apply to your system is the response. Thanks for the suggestion. Something else? – user153987 Aug 24 '12 at 0:16
    
System Readiness Tool is your next step. windows.microsoft.com/en-US/windows7/… – user3463 Aug 24 '12 at 2:43

The usual strategy for dealing with an 800B0100 from Windows Update seems to be the System Update Readiness Tool and / or the Windows Update Troubleshooter. The Troubleshooter worked for me.

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