Well, there is a known fix for Visa and you might try finding a copy that has been edited to work with XP - but I'm not even sure there is such a thing.
They violate the EULA.
That depends on the game, and EULAs, like the cracks themselves, are a gray area. But let's not talk about that and get the topic locked.
You will not be able to do that - desktop and laptop parts are not generally interchangeable. Anyways, there is not a known fix that consistently works on XP, although you might try looking for new drivers.
Well, it sounds like I'll be able to pick up my copy of Clear Sky tonight - Gamestop must be releasing them early to those who pre-ordered or something.