ive used win xp since february, never had any problems, the system is basically used for web (browsing, email), gaming (on and (sometimes) offline), doing homework, music

apart from the gaming nothing paticularly intensive, ive got a 1.53ghz, 256ddr system, ill probs get more ram for xmas

never used win2k so i can't really comment on it, but XP is fine for drivers, great for stability, only had a couple of BSoDs and they were from unusual applications (SETI@Home doesn't like it, the program which comes with my mobo to OC it, xp unsupported, and another i can't remember)