Ah, I must have messed up my project settings. I changed its directory on my computer so I could get it in source control, and I must have forgotten to move something else or change a setting.
Edit: Whoops, I'm so used to developing on VS2008 I forgot I've moved to 2010 at home. Ok, so you need these runtimes:
http://www.microsoft.com/download/en...s.aspx?id=5555