i have win xp running smoothlyon my p2 400mhz & 98 mb sdram@ 100 mhz
n btw it even doesnt take much time for loasing Xp on this system too
also remember the basics:
TURN OFF SYSTEM RESTORE, remove eerything from startup, and ofcourse dun use a a/v ,TURN OFF AUTOMATIC UPDATING, TURN OFF REMOTE TASKING and simple things to make ur xp run well on low sys without glitches