You sure its caused by XP service pack?
Fallout is incredibly buggy game.
Try reinstalling with max install,some also say that it helps when you set art_cache_size
in fallout1.cfg to higher value...you can try some patches...i have links for official 1.1 and unofficial 1.3 beta patch.
EDIT: just found on one fallout fan site that setting compatibily should do the trick.You can always try those thing above though
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