T500: XP sees only 3 GB RAM?

Hi all,
I have a T500 with 2x2G memory. It is installed with win XP. In windows XP I check it has 3G RAM.
I just replaced one ram slot with 4G but only 3G ram is shown with XP but BIOS shows 6G.
What can be the problem with my T500 and do you have any solution for me
Best
Thangpt
Moderator Note: Edited subject to match content.
Solved!
Go to Solution.

You need a 64bit OS to see all the RAM over about 3.5GB
Such as windows XP 64, Vista 64 or 7 64.

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