Control Panel -> Add/Remove ProgramsRemove VS.NET 2005, MSDN, J#, Device Emulator, etc., and .NET Framework 2.0.Then delete VS8, 2.0 Framework folders and registry keys.
That seems to do it. Beta 1 installed, without rebooting, without complaining, right after that. Of course, maybe it'll blow up when I start working, so no guarantees. But it's sure a huge improvement than Beta 1's uninstall.
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