I have windows ME and would like to upgrade to XP, however, there seems to be so much to choose from. Obviously I don't want to pay £100+ if I can get it for a lot less.Having looked on Ebay there are so many different choices for eg. Upgrade..Full..Pro..Home..Oem..Coa..Unregistered..etc.etc. Can somebody point me in the right direction please?. gopher.