Are you sure that is correct? Are you sure that is not the amount of video
RAM you have? You can go to Start > Control Panel > System, and it will tell
you the amount of RAM you have. I can't see a manufacturer releasing a PC
with 256 MB of RAM with Vista (that's lower than the required amount).
Also, you can go to Start > Computer, and it will show your drives with the
size of the hard drive, as well as the free space on the drives.