Why can you go to google and search for microsoft xp pro and find it for anywhere from 50-199 bucks a copy. Are the cheap people out there really selling legit copies of this software?
For instance...
http://www.buy-oem-cd.com/?pid=350&c...&page=winxppro http://directdepot2u.com/item.asp?PID=671
That is just a taste there are lots of sites that are very similar.