BIDS or VS 2010?
I installed BIDS (Visual Studio 2008) after installing Visual Studio 2012. This caused Start -> Run -> devenv.exe to open BIDS instead of Visual Studio 2012.
To switch back Visual Studio 2012 again:
- Visit the registry by going to Start -> Run -> regedt32
- Go to Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\devenv.exe
- Double click on the (Default) key
- Change the path appropriate to Visual Studio 2012’s devenv (e.g. C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\devenv.exe)