I am working on my wife's Toshiba Satellite C665D-S5139. It has 2, 2GB memory chips installed for a total of 4GB. The System info tells me it is a 64-bit system. However, System memory is listed at 3GB with 2.5GB usable. I suspect the video is using some.

The Toshiba specs for this computer say it is capable of 8GB. I suspect the BIOS is a 32-bit BIOS so that causes the memory restrictions. (Wht then does the system say it is a 64-bit system?) I have looked for a 64-bit BIOS for this computer but cannot find one, not even on the Toshiba site.

Am I on the right track?? If so, is the 64-bit BIOS available somewhere?? Could this be a marketing restriction?