I have a question that may be dumb to some, but i will ask anyway, since i don't understand it fully. Can i install an upgrade copy of windows xp on a blank, self built machine, if i borrow a windows 98 disk from my friend as a "verification disk". If not, can i install other free alternatives like linux, etc. that are easy to learn how to use, that will work as a good testing machine? thanks to those who can help.