I have 2 desktop and 2 laptop PC's, all Compaq. All Windows XP SP2. On one that my son used I want to completely wipe and reinstall Windows. The OS CD's I got with the computers are all mixed up, don't know which is for which. Does it matter? If I use the CD I got with one of the laptops on his desktop, since its Windows XP won't it have most of the drivers I need anyway? He has so much crap on it, I just want to wipe it and do a fresh install.