Need Windows 7 to use all my RAM

I am running Windows 7 Ultimate 32 bit. I have an Intel Core 2 Duo E8400 processor, an Asus P5N-EM-HDMI Motherboard with an EVGA Nvidia 9800 GT GPU. I have always had 2 GB of RAM. I just purchased another 1 GB DIMM and put it in the 1 empty slot on the MB. Booted up windows clicked on my computer then went to system properties and it says 3GB installed 2.00GB usable. How do I make all 3GB usable? Any help would be much grateful! Also I have tried the msconfig thing and that did not work.
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  1. I take it you're 9800GT is the 1GB version?

    32-bit Operating Systems are limited to 2^32 (4GB) of usable space. This counts main memory as well as other devices (GPU, motherboard, etc).

    In you're case, you're GPU, motherboard, and possibly other hardware are eating up 2GB of you're 4GB limit. So no matter how much memory you put in, you are limited to just 2GB.

    To be able to use more RAM, you need to upgrade to a 64-bit operating system, which allows up to 2^64 (16 Exabytes (a LOT :D )) of space for the OS to address.
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