I can't create a new project of any kind in Microsoft Visual Studio 2010, although for a very long time I could. It shows a "Couldn't create new project" error. I thought it was a MS VS 2010 issue and downloaded and installed MS VS 2012. Then, as it ran into compatibility issues, I downloaded and installed MS VS ServicePack 1. MS VS 2012 encountered the same problem when I tried creating a new project. After that, I uninstalled and re-installed both the SP and MS VS 2012 a few times. I tried running all of them as administartor, but this didn't help. I still can open previously created projects and change the code in them, but this feels stupid.
PS I'm under Win 7 64-bit Ultimate Edition.
PPS I have a strong feeling that I've inadvertently deleted something really criticall for the correct creation of new projects while freeing up disk space. If I did indeed, I'll be ever-watchfull again, but first I have to solve this problem.
PPPS Please don't recommend re-installing Windows - it's too much of a bother.