How to force to reinstall Vista SP1

**Ronchi** · 23-05-2009

I am already using Vista SP1 operating system on my computer. What i need is to reinstall Vista SP1 on the same computer.I don't want to zap the computer and start over again. But whenever i try to do that, windows says SP1 is already installed on the computer. Is there any way i can force Windows Vista SP1 to reinstall ? Thanks in advance.

**Calvin K** · 23-05-2009

Well, to force Vista SP1 to reinstall on the same PC, go through this steps:-

1. First of all perform a clean installation of the released version of Windows Vista and install all Windows Vista critical and important updates.

2. Now before the Windows Vista SP1 update, make sure your device and driver functioning properly including making changes to the default device configuration.

3. Now run the following commands at an elevated command prompt to configure your PC to download Windows Vista SP1 over Windows Update:

. reg delete
HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentV ersionWindowsUpdate
VistaSp1 /f > NUL 2>&1
. reg delete
HKEY_LOCAL_MACHINESOFTWAREWow6432NodeMicrosoftWind owsCurrentVersion
WindowsUpdateVistaSP1 /f > NUL 2>&1
. reg add
HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentV ersion
WindowsUpdateVistaSp1 /v Beta1 /t REG_SZ /d dcf99ef8-d784-414e-b411-81a910d2761d /f

4. Now install Windows Vista SP1 from Windows Update and confirm that your device and driver functionality and configuration is same as before.

Thats it !!!

**Lillebror** · 23-05-2009

If your windows says that SP1 is already installed on your computer, than try this:-

Go to Start and search Windows Update.
Open Windows Update and go to "See Also link and click on Installed Updates Find "Service Pack for Microsoft Windows KB936330" and click it
Now click on Uninstall at the top.
Restart the pc and let it uninstall
Once it has uninstalled download the standalone installer or install it from Windows Update.You are done.