I use a Celeron 1.8, 512 DDR RAM system. I used to have XP Professional installed on my PC about 2 months ago and ran everything (Photoshop, Premier, Visual Studio, Visio, Word, Access, Imesh, Kazaa, Gamespy, Nero, Internet Security, Antivirus, Netscape Navigator, MSN Messenger, ICQ, Yahoo IM, AIM, AOL, Media Player, plus IIS, SQL Server and other default services), at most 10 of em at the same time plus the standard window services and my pc slowed down of course...but it never crashed (although just Imesh crashed sometimes). I thought this slowing down was cause XP Professional was crap, so I did a bench test on 98, 2000 Professional n Advanced Server and XP (Professional that is, Home is a joke!). I installed everything mentioned above plus a little more. 2000 Advanced Server won, then 2000 Professional, then XP. 98 wasn't even visible at the end of the race cause it so far behind and so RUBBISH!!! I'm currently using 2000 Professional (Norton Anti Virus doesn't install on Advanced Server) since it proved to be the best OS for me to use. My conclusion...XP outdoes 98 in everyway....XP sucks only in the memory eating department...apart from that I prefer everything alse about XP than any other Windows OS. I've tried installing Nimo 5 Codec Pack on 2000 Professional already and there were installation problems, just thought I tell you since I know nothing about the codecs/video drivers side of things.