Up until today, I could open and work with Visual Studio 2012 on my computer. Now when I open it, it shows the splash screen, then the main application window without any projects loaded - but doesn't get any further than that. The mouse icon is still that of a spinning circle (i.e. it is busy doing something).
If I click in the window a couple of times this message shows:
Microsoft Visual Studio is Busy
Microsoft Visual Studio is waiting for an internal operation to complete. If you regularly encounter this delay during normal usage, please report this problem to Microsoft.
I can't even uninstall Visual Studio 2012 since the uninstaller hangs when it opens.
The same thing happens if I open Catalyst Control Center. The window opens but I cannot interact with any menus or the window decorations themselves.
What is going on?