I'm having a problem with running Windows 7 on all my sticks of ram. Before I say anything, I have relatively old hardware in my computer (3 1/2 years now). I recently installed Windows 7 64 bit (which was a struggle in itself). I had 4 GB of DDR ram (4x1GB) and Windows would crash on install. I took one stick out and the install ran fine. Then it would freeze at the end of the install, so I had to take one of my video cards (Geforce 7950) to finish installation. After Windows 7 installed, I just downloaded the graphics drivers and it runs fine in SLI now. But I still can't get the OS to run on all 4 GB of ram. When I boot up, the system will reset itself upon booting of Windows. With 3GB and SLI graphics cards the system runs fine. I don't know if this is because my hardware is simply too old and incompatible or if the motherboard doesn't like all the ram slots occupied... or whatever else the problem may be. Also, when I look in bios with 4 GB or ram, it shows all installed and usable. However, with the 3 GB, it shows 3 installed but only 2 usable. Any ideas? Any input would be appreciated!