Here is the official response from Microsoft about this update:
On Tuesday Microsoft released
KB 976902 to customers of Windows 7 through Windows Update. This update was pre-maturely released in English and the KB article had not been published yet. We are in the process of releasing the KB Article so users have more information about the update. This update is a Servicing Stack Update, which can’t be uninstalled. The update will be released at a later date, and it will be required to ensure compatibility with some future updates.
If you have already installed the update, there is no action required – there is no impact from the update being on your system. We apologize for any confusion this update may have caused.
Also, for extra context – Microsoft did a similar update when we were about to release the SP1 beta (what’s known as a “service stack” update – it helps the OS recognize and work better with the service pack code). As things like a service pack in development hit new milestones (i.e. we just hit RC, before that it was beta), the service stack update gets updated. That’s why folks don’t need to worry about removing it
the files updated from this are the following:
PkgMgr.exe
CbsCore.dll
cmiv2.dll
drvstore.dll
fastprox.dll
helpcins.dll
smiengine.dll
wbemcomn.dll
wbemcore.dll
wcp.dll
wdscore.dll
The above files will now be version 6.1.7601.17105, now the crazy thing about this update is the file version doesn't even get changed (properly)
The original version of the above files is 7600.16385 the ones from the update are simply extracted to a folder C:\Windows\winsxs\x86_microsoft-windows-servicingstack_31bf3856ad364e35_6.1.7601.17105_non e_0b7293d225839c39 and seemingly just sit there. The other odd thing is the version of the files from this update are the same as the ones from the win 7 sp1 rc released not to long ago. It appears MS released this update to soon and the files will later once again be either changed or updated to the correct ones for the actual rtm release of win 7 sp1 update.
Hopefully this response from Redmond is as clear as mud, and helps Y'all to understand this messy update (scratching head]
