Yes you can install XP on a formatted hard drive, should you decide that you don't want them to install an OS for them. On another note, I strongly suggest you build a computer yourself, you'll get much better parts for the same amount of money, you'll learn something new, and iBuyPower doesn't do a very nice job in setting up the computers, from what I've seen. Also, if you change any parts in an ibuypower computer, it voids their warranty.
