bro you really need a OS upgrade
Fyi windows xp isn't using all 4gbs but 2 gbs and I highly doubt your using 64 bit simce win xp 64 bit sucks.
I know.I never said I was using 64bit XP. And I thought XP only used 3GB's of RAM instead of 2? (Up until you changed that boot setting somewhere) And now that I think about it I might only have 3GB.