How to Uninstall the Vista SP1
InformationYou can remove SP1 by using either Programs and Features or the command line. Note, however, that you cannot uninstall SP1 offline using any method. In addition, it is not possible to uninstall the permanent prerequisite updates (KB937287, KB935509, and KB938371). However, you can uninstall KB936330 and KB937954. You also cannot uninstall the service pack and other updates that were installed using an integrated installation.
For more information, see: Microsoft Help and Support: KB948537
For more information, see: Microsoft Help and Support: KB948537
OPTION ONE 
1. Open Control Panel, click Programs, and then click View Installed Updates.
2. In the Microsoft Windows list, right-click Service Pack for Microsoft Windows (KB936330), and then click Uninstall.
3. When prompted, restart the computer.
OPTION TWO
1. Open an elevated Command Prompt window (click Start, type command in the StartSearch box, right-click CommandPrompt, and then click Run as administrator).
2. Run the following command (assuming that Windows6.0-KB936330.exe is in the C:\temp folder): C:\temp\Windows6.0-KB936330-X86.exe /x:C:\temp
3. To create a sandbox, type md <sandbox>.
4. To remove SP1, type start /w pkgmgr.exe /m:c:\temp\Windows6.0-KB936330-X86.cab /up /s:<sandbox>. 5. After Pkgmgr.exe completes, you will be prompted to restart the computer (unless you specified the /quiet command with Pkgmgr).
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