ummm, vista does not have any "anti-piracy" protection as M$ only cares about not pirating their shit.... so if your copy is legit, everything else under that is cool. And just some food for thought, 4 years later after XP and its still not bug free, don't think for a second Vista will be flawless from the gate. And putting another OS or replacing your OS on your PC can be a headache, but it also be easy, so not every situation is the same.... But once again, if you have pirated programs, M$ can't do anything about it anyway, so no worries.

Good luck. and for games, it is not as bad as everyone says, its not the greatest.... so good luck