Q. Can I upgrade the Windows 7 and Windows Server 2008 R2 SP1 RCs to the RTMs?

A. You can't upgrade the RC of SP1 to the RTM. You need to uninstall the RC version of SP1.

Start the Programs and Features Control Panel applet, select View installed updates, select Service Pack for Microsoft Windows, and select Uninstall.
SP1 Uninstallation
SP1 Uninstallation

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