Whoops. Got to uninstall all the .NET 4.x bits or Server Manager breaks...

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Fiddling around with TFS 2010 (x64) got me into a little trouble:

"MMC could not create the snap-in. The snap-in might not have been installed correctly. CLSID: FX:{18ea3f92-d6aa-41d9-a205-2023400c8fbb}"

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Doh.

Fortunately, there were just two more .NET 4.x Beta 1 items in PAF (on 2008, formerly known as ARP on 2003) that I overlooked for a total of 4 items to uninstall to put the system back in order.