A blocking tool is available for organizations that would like to temporarily prevent installation of Service Pack updates through Windows Update.

This tool can be used with:

Windows Server 2003 Service Pack 2 (valid through March, 2008)

Windows XP Service Pack 3 (valid for 12 months following general availability)

Windows Vista Service Pack 1 (valid for 12 months following general availability)

This toolkit contains three components. All of them function primarily to set or clear a specific registry key that is used to detect and block download of Service Packs from Windows Update. You only need to use the component which best serves your organization

I remember when they did this for IE7

Gr8 find