Ive already fixed it. I'm not really sure what happened to it in the first place though.
Since it wouldn't let me into startup repair, or repair from the windows installation, I found that you could press shit+f10 to open command, and from there I did a dskchk on both C: and D:.
C finished in about a minute, and D froze at about 57%, so I figured that was where the problems were originating. So I then went ahead and did a format D:, and that fixed everything.
I assume some part of the windows update I did corrupted the registry or something along those lines
Sent from my Galaxy Nexus using WindowsForum mobile app