xp is a serious resource hog. but it does seem to be a tiny bit more stable, particularly more forgiving with drivers and bad files than 2000.
i had issues with 2000, that when it crashed, it _crashed_, and generally a reinstall was necessary. i installed the logitech mousware drivers one time, and my keyboard locked so i couldn't log into the machine.. lol.
also, be wary of sp1 in 2000. it had issues that sometimes destroyed a file system, taking your files with it.
if it's a slower machine, use 2000.
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