Description:If for some reason you have not been able to upgrade to Windows Vista Service Pack 1 (SP1), an update is available from the Microsoft Download Center that might improve the performance and reliability of Windows Vista. If you are already running Windows Vista SP1, you should not download this update. The fixes that are included in this update are already included in Windows Vista SP1.
Update type: Recommended
Release date: April 8, 2008
Applies to: All
Knowledge base: http://support.microsoft.com/kb/953095