Uninstalling SP1 using Programs and Features

The easiest way to uninstall SP1 is using Programs and Features.

1. Click the Start button , click Control Panel, click Programs, and then click Programs and Features.
2. Click View installed updates.
3. Click Service Pack for Microsoft Windows (KB 976932), and then click Uninstall.

If you don’t see Service Pack for Microsoft Windows (KB 976932) in the list of installed updates, your computer likely came with SP1 already installed, and you can’t uninstall the service pack. If the service pack is listed but grayed out, you can’t uninstall the service pack.

Cr. http://windows.microsoft.com/