That's weird, why would it not be compatible?! I thought the whole point of windows was that it was compatible with everything...maybe not though. I've not got Windows 7, I'm really reluctant to get new versions when I don't have to, have you tried Dell online? They might sell something other than windows 7, otherwise you can get SPSS 18, surely your uni has a free copy for students? We can get it free for our work computers, but I always just load it onto my home computer as well :$