hey ppl i posted i thread about windows boot disk and it changed into a bit of a chines whispers in turn into what os was good to use so i thought id ask,what is the best windows to use

win 98 i never had any problems with it apaert from shutting it down
win me never used it but i have it
win2k i have this but not used it thought it was just the same as winme but a upgrade
win xp i have this on my pcs now 1 of my pcs runs perfect the othere keeps shutting down and re starting and i cant use it plus i get a msg saying memory dump bla bla bla

so which one should i use lets all geti nvoled in this thread
in short...?????whats the best windows os to use ??????