As this seems to be an installation issue on your machine, I'd rather keep the discussion here.
Certainly VS does not handle upgrades from Preview/RC versions very well (though it seems to be significantly improved for VS 14), and our integrated package didn't handle uninstalls well either. If you had any plans to clean your entire system, this might
be good motivation to do that sooner :)
Otherwise, you may be running into issues because you haven't cleaned up the "Microsoft.VisualStudio.ReplWindow" extension (or similar), that should be in
Microsoft Visual Studio 12.0\Common7\IDE\Extensions\Microsoft
alongside where PTVS is installed. This is actually part of PTVS, but it had the wrong name up until recently.
You may also need to remove some files from the global assembly cache (GAC). To do this, you'll need a copy of gacutil (it comes with some older versions of Visual Studio or in the Windows SDK - search
Program Files (x86)
to find it). Then you'll want to use
gacutil /l <name>
to find the full names of the assemblies below, and then
gacutil /u <name>
to remove them. If you haven't fully cleaned up the old installation, then they may refuse to be removed - try
to fully clean it up. You should also uninstall your current version of PTVS before attempting this too. (And please don't go removing any assemblies other than these - this is a pretty easy
way to break your entire machine...)
The assemblies you'll need to remove are:
Note that not all of these may be installed, depending on which version of PTVS you had. After removing these, you
reinstall PTVS in order to replace the files that are necessary.