[racket] DrRacket problems, please help (I need it for homework)!

Recently I've been having trouble with the DrRacket executable hanging. When I attempt to launch it, the window will pop up, the menu bar will display...and then nothing else happens - except devouring my computer's CPU like crazy. The icon at the bottom right corner shows that it's trying to load, but for whatever reason can't complete it. I decided to try and reinstall the program (several times) but the same thing happens each time I try launching the executable. I even tried re-downloading...and got the same results. Please help? It's not my computer either, because it functions beautifully and other programs work just fine on it.