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So here's the deal... I'm not an utter noob when it comes to computers, but I'm completely befuddled by my current situation. I recently installed windows 7 on my computer. To do so, I had to take out one stick of my G.skill 2 gb 1333 RAM. Now that windows 7 has been installed, I can't reinstall the RAM I took out. Every time I attempt to boot Windows with more than 2 gb, I don't get very far. The system says "Starting WIndows", and it stalls... permanently. It doesn't move forward. That, or it restarts and continues a vicious cycle of restarting. I should probably mention that I installed windows 7 over windows xp, with Windows xp being the 32 bit version and windows 7 being the 64 bit. I've run memtest on each stick of ram individually, and no errors show up. But the minute I have both sticks of RAM in there it doesn't boot. Each and every motherboard slot is fine (More than 10+ test repetitions on both). I've used both sticks together in a friend's computer, and both work great. I don't understand what's going on. Can someone help me out?