I think he's (gutharius) is speaking of the ram count in the POST (pre-operating system test) when you boot up. Your ram count will ususally flash on the screen before the OP system loads. Unless you have disabled that feature in BIOS (or if it's an HP or such, they seem to have it disabled from the factory).
Fern
EDIT: Why not double-check windows with a proggie like Memtest86. When you boot to it, it'll show the amount ram in the uper left-hand corner. It won't use windows info since's it's a free standing bootable proggie. Plus it'll test the stability of your ram as well.