Official sources:

http://support.microsoft.com/?kbid=938194

http://support.microsoft.com/?kbid=938979

Community announcements:

Brad Rutkowski's Blog : Vista: Two hotfixes now released to improve performance, compatibility, and reliability.

Windows-Now : Windows Vista Pre-SP1 Performance and Reliability Updates Released

ActiveWin : Update for Windows Vista (KB938979)

ActiveWin : Update for Windows Vista (KB938194)

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