Please post the CheckSUR log so that we can take a look (Richard is the expert, at this point!)
Here it is:
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Checking System Update Readiness.
Binary Version 6.1.7601.21645
Package Version 13.0
2011-12-23 21:54
Checking Windows Servicing Packages
Checking Package Manifests and Catalogs
(f) CBS MUM Corrupt 0x00000000 servicing\Packages\Microsoft-Windows-InternetExplorer-Optional-Package~31bf3856ad364e35~amd64~~8.0.7600.16385.mum_old0 Expected file name Microsoft-Windows-InternetExplorer-Optional-Package~31bf3856ad364e35~amd64~~8.0.7600.16385.mum does not match the actual file name
(fix) CBS MUM Corrupt CBS File Replaced Microsoft-Windows-InternetExplorer-Optional-Package~31bf3856ad364e35~amd64~~8.0.7600.16385.mum from Cabinet: C:\Windows\CheckSur\v1.0\windows6.1-rtm-client-neutral-amd64.cab.
(fix) CBS Paired File CBS File also Replaced Microsoft-Windows-InternetExplorer-Optional-Package~31bf3856ad364e35~amd64~~8.0.7600.16385.cat from Cabinet: C:\Windows\CheckSur\v1.0\windows6.1-rtm-client-neutral-amd64.cab.
Checking Package Watchlist
Checking Component Watchlist
Checking Packages
Checking Component Store
Summary:
Seconds executed: 471
Found 1 errors
Fixed 1 errors
CBS MUM Corrupt Total count: 1
Fixed: CBS MUM Corrupt. Total count: 1
Fixed: CBS Paired File. Total count: 1