Visual studio 2013, can't open or create projects

I tried getting Visual Studio 2013 to work today but i couldn't get it to work. This is the error I keep getting when making a c++ window application.

The error message I keep getting:

I tried opening the vcxproj file in the message box, but I couldn't open that either. In fact I am unable to open any vcxproject's. This problem happens with pretty much all languages.

I uninstalled vs 2012 and 2010, and then installed vs2013.

I have tried :

1. reinstalling the nuget extension.
2. Reinstalling vs2013 a bunch of time and trying to repair the installation
3. Uninstalling all traces of vs2010 and vs2012

one thing that might be important is that I used the november CTP c++ preview compiler for vs2012. I can't seem to uninstall it though

but nothing helped so far. Anybody able to help me?

I decided to bite the bullet and re-install windows 7. Everything works again. In the future I will probably avoid downloading CTP's though or be very careful about uninstalling them.