I don't have that game but I am almost certain that your setup isn't sufficient to run in that resoloution with the goodies turned on ............... esp on win xp . You will have to at least change the cpu .
Another 128 mb of ram wouldn't hurt either esp in xp. Your video card is decent enough esp if it is a ddr radeon.
No it's the Sddr version and plus besides I'm changeing everything in the system in the spring time..So it's not much of a big problem... going to get a Geforce 4 Ti 4600 and 768Mb of Ram..That should be Good enough...and a Amd Duron 1.2Ghz then later move to the Amd XP 1800+