I have just installed Windows 7 Home Premium on a just-built computer but every now and then, it just suddenly freezes. I can't even move the mouse or use keyboard and have to restart. The computer was running the RC version just fine but I bought a Samsung F3 together with the Win 7 and installed the new Win 7 on the F3. The old F1 I was using before (with the RC on it) was reformatted. Does anyone have any suggestions on what could be causing this??? EDIT: also, am I imagining it or is Win 7 Home Premium 64bit Retail slower than Win 7 Ultimate 32bit RC.