Equium A100-338 doesn't recognise 4GB of RAM
I have an Equium A100-338 laptop which had 32Bit Vista Home Premium on when I first bought it several years ago. I upgraded the memory from 2 to 4GB soon after getting the laptop but it would only use 3GB. Recently I upgraded the OS to 64 bit Windows 7 professional which is all workng fine except the system is still only making use of 3GB of the installed RAM.
There doesn't seem to be much in the way of Windows 7 driver updates on the Toshiba website for this model. I tried the available OS independent BIOS update but this failed to complete as it was unable to load a driver file from my AppData folder.
Has anyone had any similar experience or could offer some advice?