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Unable to install Windows 7 Service Pack 1

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Last Modified: 2015-09-21
I am unable to install Windows 7 Service Pack 1 on a desktop PC.  I get this error message:

Installation was not successful
"The referenced assembly could not be found"
Error: ERROR_SXS_ASSEMBLY_MISSING(0x80073701)


I have tried running a couple utilities from Microsoft:

* Automatically reset Windows Update components
* System Update Readiness Tool for Windows 7 (KB947821) [August 2011]
* sfc.exe /scannow

I also updated the driver for the graphics card.

Any help would be greatly appreciated.

Thanks, Jon
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