I had Visual Studio 2015 RC installed and installed Visual Studio 2015 RTM over it. I couldn\'t find anything on the Internet that said you couldn\'t d
My problem happened after installing Visual Studio 2015 Update 1.
I tried all suggested solutions without luck. The solution which worked for me was a one from Eric Knox (Microsoft team).
This is it:
Open an administrator command prompt and run these steps (assuming you installed to the default location):
cd "%ProgramFiles(x86)%\Microsoft Visual Studio 14.0\Common7\IDE"
ren devenv.exe.config devenv.exe.config.backup
copy .\devenv.exe.config
devenv /UpdateConfiguration