My windows 7 also randomly freezes :( I need to do a memtest. Although, I've seen plenty of topics from people whose laptops are freezing randomly even though the memtest shows nothing. The weird part about the freezes is it acts like a virus, slowly spreading across my open programs. It starts with the active window, then whatever I click on (such as explorer) and eventually the mouse freezes. Then after 30 seconds or so it goes back to normal. This started happening in the rc and is a little better in the rtm (provided by IEEE).
Problem is mine doesn't go back to normal.
Memtest86 bootable shows no errors in the memory. I'm gonna try rearranging my RAM into dual channel to see if it works better.
I re-arranged my RAM in my case so that the two 1GB 667 MHz sticks are in yellow and the single 2GB 800 MHz stick is in one red slot.
Now it's running in Flex Memory mode, not dual channel which is some technology, according to my mobo manual, "offers greater flexibility to upgrade by allowing different memory sizes to be populated and remain in dual channel mode/performance."