cpu: Intel i7 950 3.07ghz
ram: 12gb DDR3 1066mhz SDRAM
video card: ATI Radeon 4850 512mb
When I got this machine it came on Vista 64 bit. Vista showed 12gb of ram when I right-clicked Computer and went to properties, showing under computer performance. After I installed Windows 7 Ultimate 64 bit, it only shows 8gb of Ram. How do I fix this?