I have an evaluation version of windows xp professional cd(came with an MCDST book to help me practice the scenario questions) that I wanted to install as an upgrade to the windows xp home edition that I am currently using. someone told me that I cannot upgrade from home edition to pro, and that I have to do a clean installation instead. This is the only computer I have and I don't want to mess it up. What are my options? can someone please help me?