Hello, I installed Win7 64 on my machine, with 4GB of RAM, and everything was running beautifully. I decided to up to 8GB, and at that point the system became basically unusable. Different memory tests all showed that the memory is fine, the motherboard supports 8 GB, and it showed up as such in the BIOS. But Win7 was a disaster, so I had to switch back. Anyone else had this problem? I know it must sound like an extravagant question, but I do a fair amount of compilation and multimedia work on this machine, so I'd really like the RAM if it's at all possible. Thanks.