I live close by to your dorm. I format and install new OS all the time. I don't know about Alienware but if you follow the step correctly with a regular XP installation disk, you can partition, format, and install fresh Windows. If you didn't go through the correct menu, XP will install two copies of itself. You can remove the dual boot promp from the control panel. But it's best if you could try to install Windows again and pay attention to the menu choices.
Look at all those live rocks on the beach at Florida's state park!