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How to Uninstall the Vista SP1

To Uninstall SP1 by using Programs and Features:

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.

To Uninstall SP1 by using the Command Line:

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 .
4. To remove SP1, type start /w pkgmgr.exe /m:c:\temp\Windows6.0-KB936330-X86.cab /up /s:.
5. After Pkgmgr.exe completes, you will be prompted to restart the computer (unless you specified the /quiet command with Pkgmgr).

Source : Vistax64