eeeeek, that sucks >_<. Im running xp SP3 too and everything works fine. are you sure your sys requirements are up to par? And since you had to reinstall windows, make sure you have the correct video drivers, and make sure they are the most up to date ones.
(last post didnt go through, hope this one does xD)
My sys is above the requirements. My computer is parctically new. I know it's not my graphics card, cause that runs COD4 as smooth as silk. I'll have to check on the video drivers, though.
BTW, I like your sig. Poem off the base of the Statue of Liberty.