Sometimes you can’t do a clean install of the OS and move to Win8 RTM.  One of my machines I’ll be using for an ongoing project it’s in that “perfect” operating mode – except for the RC versions of Visual Studio 2012.

The following links provide the upgrade paths as needed (note that with Win8 – must move to RTM of Win8 to get VS2012 RTM.

How to uninstall Visual Studio 2012 Release Candidate

http://support.microsoft.com/kb/2744926

Upgrading from Visual Studio 2012 RC to RTM

http://blogs.msdn.com/b/heaths/archive/2012/08/17/upgrading-from-visual-studio-2012-rc-to-rtm.aspx