1. Open an elevated Command Prompt window. To do this, click Start , type command in the Start Search box, right-click CommandPrompt, and then click Run as administrator. 2. Run the following command, as appropriate for the version of the Windows Vista service that you want to uninstall:

For Windows Vista Service Pack 1: C:\temp\Windows6.0-KB936330-X86.exe /x:C:\temp

Note This command assumes that the Windows6.0-KB936330.exe folder is in the C:\Temp folder

For Windows Vista Service Pack 2: C:\temp\Windows6.0-KB948465-NNN.exe /x:C:\temp

In this command, NNN represents x86, x64, or IA-64.

Note This command assumes that the Windows6.0-KB948465-X86.exe folder is in the C:\Temp folder.

3. You have to create a sandbox environment before you can continue to step 4. This helps you safely run an untrusted program. To create a sandbox, type md sandbox. 4. To remove the Windows Vista service pack, type, or copy and paste the following command, as appropriate for the version of the Windows Vista service that you want to uninstall::

For Windows Vista Service Pack 1 start /w pkgmgr.exe /m:c:\temp\Windows6.0-KB936330-X86.cab /up /s:sandbox

For Windows Vista Service Pack 2 start /w pkgmgr.exe /m:c:\temp\Windows6.0-KB948465-NNN.cab /up /s:sandbox.

In this command, NNN represents x86, x64, or IA-64.

5. After Pkgmgr.exe finishes, you are prompted to restart the computer to complete the uninstall process.