Asus m4a785 m mem

I have a Asus M4A785-M MB I have 4 gig mem but win xp reports 3.25 gig. I have a ati 5750 card in PCI -16 slot. Bios is config for PCI-16 card. How do I get the .75 gig back ?
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  1. Are you using Windows XP 32-bit? If so, then that's normal - you'll need to install a 64-bit version in order to be able to use all 4GB.
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