I just built a computer, and my error region is my ram. i have 4gb(2x2gb) DDR3 1333 ram. My BIOS says that i have 467892??? anyway my BIOS says i have 4gb RAM. I checked it on my computer, running Windows XP SP3, the "System" panal under Control Panal says i have 3 GB ram. How can i be sure that my comp is using all 4 gb?