Uninstalling Windows Server 2008 R2 SP1 Beta and RC

Before you can install Windows Server 2008 R2 SP1 (or Windows 7 SP1), you need to uninstall the beta or RC version that might be installed. On a GUI install of Windows Server, no problem, run AppWiz.cpl and click on Updates. But on Hyper-V Server 2008 R2 (or Server Core) there is no obvious way to uninstall the beta or RC versions of the Service Pack. You need to use the command line version of the Windows Update Installer: wusa.exe.

wusa.exe /uninstall /kb:976932

It’ll take a couple of reboots before it’s completely uninstalled, and then you can install the SP1 you just downloaded.

Update: Note, if it wasn't clear. This command line works equally well from GUI installs, including Windows 7.

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