Usable memory problem

I have Asus Board and AMD Athlon CPU, i installed 2 operating systems in my Disk.
Windows 7 64 Bit and Win XP 32 Bit.
I hav 2GB's 2 Ram means my total memory is 4GB.
But i have problem with usable memory.
in Windows 7 64bit in System properties usable memory is 3.87 GB.
but in Win XP system properties only 2.87 GB Memory usable.
plz tel me how can i fix this memory problem in Win XP
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  1. Best answer
    you can't its a 32 bit OS and restricted to addressing 4gigs total (including ram on you graphics card thus the lack of a full 4 in system info). you need xp 64 bit
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