8400gs Driver Download
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i dont know what your os is, but just go to the 8 series in the drop down menu and select your operating system and download it
http://www.nvidia.com/Download/index.aspx?lang=en-us
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It's a good idea to disable the onboard video in the BIOS. This may help and you'll get some of your memory back. Your processor would also support a 64 bit operating system - this would make all of your memory available. A 32 bit OS can only 'see' 4GB of address space, this has to include the address space of all the hardware, the memory and the graphics memory. The available RAM is up to 4GB minus the other hardware's requirements
Any chance there is a system restore point that you can use to rollback the change?