This is a case of YMMV. OEM copies of XP were supposed to be this way, but when my old PC died I used my OEM copy from it to set up dual-booting on my current computer, and I didn't have any problems installing at all. It had been a couple years since I changed hardware at all, but moving to new Mobo, CPU, video card, hard drive, etc. should have triggered it, but didn't.