I don't see anything in the event logs about stability or nonresponsiveness. I have found a few threads saying things about Intel SSDs. Could that be the problem? Windows 7 is on the SSD.
I've been using Windows 7 64-bit for several months, but just a couple weeks ago it began hanging randomly. It doesn't matter what program I'm in, randomly the program will stop responding, and I'll get the message "Not Responding" in the title bar of the app. The mouse and keyboard still...