I would have to agree with Kaviar. Windows XP is nearly 10 years old. Not only would you have to go through a pain in the arse install process, it's going to take you over an hour just to get it patched up with the latest updates. And that's with having SP2 and SP3 installers on hand.
I recommend Windows 7. Not only is it a more secure version of Windows and you can install all of the critical patches in one reboot, it works very well on my late 2009 MacBook Pro with the latest Boot Camp drivers. In fact, I use it as my primary OS on my laptop.