what video card do you have?? DUHR
if its onboard video memory, then that could slow it down.
if its just a crappy graphics card then thats your problem.
maybe try changing the sound settings for your computer, those make a difference.
end some services that dont need to be run, that could be a difference too.
http://www.blackviper.com/WinXP/service411.htm
if you need anything else, please leave another message and i'll get back to this thread as soon as i can!
good computin!