Greetings All, I am a genuine newbie to this site and forum, so I apologize if this topic has been covered elsewhere here. I searched around before posting, but didn't find the answer. I have decided to upgrade my old Dell XPS T600 (288MB RAM, 2 Int. Hard Drives: 8.5 & 2.4GB, 1 Ext. HD: 75GB) from 98SE to Win 2000 Professional. My question is: what to purchase on the auction/for sale sites? It seems there are 3 choices: a "new" 2000 Pro "Full Version" in a "factory" sealed box (This seems like what would have been available in a retail setting); what appears to be a 2000 Pro package that was shipped as OEM; and an "Upgrade" version of 2000 Pro, again in a retail box. The last bit of information may determine which I should choose. I have my Win 98 disk that was shipped with the Dell, but ALIENS (and I don't mean those carrying Green Cards ) have apparently absconded with my MS supplied 98 to 98SE upgrade disk, so if I'm asked to insert my 98SE disk during the install, I'm dead in the water. Any guidance on this matter would be sincerely appreciated! Mark