Can't log into BTTF

I tried to log into BTTF for the first time, and it crashed on me. Now it wont load at all. I looked up this issue, and it seems I need Admin rights to play? I'm using a computer where I dont have access to Admin. No other program requires this. I am using windows XP and can't get it to work in any compat mode.

Why do I need Admin rights for a game I just purchased???

Hello McFly???????????
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