since you have bluetooth, you can connect to a windwos (XP/Vista/7) with search devices. but can't use the Multi-Touch founction unless you are using windows on Mac with bootcamp.
why u wanna use apple magic mouse on your pc?? i don't use that even i'm using an imac...
trackpad is way much better and it has more gestures. logitech has come out a new trackpad which supports both pc and mac. u may wanna check that out