Visual Studio 2012 Fatal error 0x80131c39

I am going bloody insane, I have installed a different type of Windows 8 (pro) at work, and now VS12 gives me this error. At home I have home edition W8 and everything works fine. I found ONLY ONE PERSON encountering this error EVER in Google, and he solved this by switching to .Net 3.5. But I am running an XNA 4.0 game (with a hack to make it work on VS12) and I don't have this option. Has anyone else EVER encountered something like this?