I use virtual p.c. on an ibook, got it for free and it's dreadful. All it is is an emulator that will run windows xp, and it does it abysmally slow. But atleast the kids can play dos games in the car. lol
You could get an emulator from click here . The pear pc v0.1.2. (JITC). I have never used it so cannot comment on it's performance. I would guess that the performance of this is equally dreadful. The only thing going for it, I think, is it is free. Although you would need to purchase Panther or Jaguar to run it.