I have my computer with Windows ME on one Hard Drive and the XP on another( I know it´s not the best way to have it but I need it this way), I still have some programs that doesn´t work on XP.....I had a few errors and still have(and not certain that I wouldn´t had them with a clean install), but I´m satisfied until now....and later , maybe I´ll make a clean istall.... So, go to the BIOS setup, make your computer boot from CD, and make a install of win XP, Win XP won´t make an upgrade, will install "at a side" of ME, and when you start your computer you will choose wich one you´ll work.....:beer