Inventor Help

A little problem-
I just got inventor 10 installed, so I tested it on the admin account on my comp. It worked great (I love it, by the way), until I signed into my normal account to try it out. I started up, no problems. Once I tried to open a new blank part, it sort of froze for a few seconds, and the program crashed. I've tried this with nothing else running, and a bunch of other things, and frankly I'm stuck. Anyone have any ideas?