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How to uninstall Vista SP1

You may have two methods to uninstall Vista SP1.

I. To uninstall SP1 by using Programs and Features

1.   Go to Start>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.   Reboot the Vista

II. To uninstall SP1 by using the command line

1.   Open an elevated Command Prompt window from Start, (type cmd in the Start Search box, right-click Command Prompt, and then click Run as administrator).

2.   Run the following command (assuming that Windows6.0-KB936330.exe is in drive:\folder ): drive:\folder\Windows6.0-KB936330-X86.exe /x:drive:\fodler

3.   To create a sandbox, type md <sandbox>.

4.   To remove SP1, type start /w pkgmgr.exe /m:drive:\folder\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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