lol, I have two! rofl! omg! lol! Let's see, I have a dedicated Windows XP machine. I have Windows XP that runs on the Mac as well as Windows 7 which runs on the same Mac (bootable, none of this virtual nonsense). They all work great. I've never had any problems with viruses, etc. I've had a few power supplies die on the dedicated PC, though.
I will state right here that I do not give a shit about gaming on the computer, be it Mac or PC. Just don't care. Not interested.