I'm running XP home on a P4 2.4......... and I decided tro go from 512 to 1 gig RAM. RAM is cheap right now. Comp USA has 256 M sets for $18.00 after the rebate...... $50.00 before.
I got a 512 M module at my clone dealer for $80.00.
Win XP is a memory hog....takes a lot fo the base op system. But remember I am not satisfied with FS unless the sliders are maxed out and there is a lot of AI traffic

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best,
..................john

Intel i7 960 quad 3.2G LGA 1366, Asus P6X58D Premium, 750W Corsair, 6 gig 1600 DDR3, Spinpoint 1TB 720