I use xp because it's stable, fast and compatible with the latest software. I have a PIII 800 512MB RAM PC and the system starts in less then 20 secs after pressing power button, and i use NAV2005 . The PC is on for several days before reboot, meanwhile downloading, playing warcraft3, editing video, and of course browsing the web, and it doesn't crash. This was impossible to achieve on win98se. The blue screen appeared only after 12-24 hours of constant use. Besides all new programs are made basicly for xp.