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After you install Windows Vista Service Pack 1 (SP1) on a computer that is running Windows Vista, you may notice that your computer's Windows Experience Index score has changed. For most computers, the Windows Experience Index score does not change after this service pack is installed.
Windows Vista SP1 corrects the way that the Windows Experience Index score is calculated for certain hardware configurations. In Windows Vista SP1, the Windows Experience Index score more accurately reflects the ability of the computer to support Windows Vista features. After you install the service pack, this score may drop by 0.1 or 0.2 points.
On some computers, this drop in the computer's Windows Experience Index score may cause the Windows Aero feature to become disabled. For more information about how to troubleshoot issues with the Windows Aero feature, click the following article number to view the article in the Microsoft Knowledge Base:
945000 You may experience issues with the Windows Aero feature on a Windows Vista-based computer
For more information about the Windows Experience Index, visit the following Microsoft Web site: