I had a problem with my computer restarting itself a while back. It seemed to be happening after the computer had been on for a long time.
I thought it was motherboard drivers or windows crashing. But when I went to take a look at the hardware of the computer I noticed the fan on my powersupply wasn't working. Hence, my problem.
So before you reinstall windows, or anything else that could possibly lose a lot of time/info for you. Check the simple stuff like the fans (power supply and cpu). It could be your computer is just overheating. And EQ does pull a lot of resources from your computer. That could be why it's only happening to you when you're trying to play EQ.
I'm not saying this IS the answer to your problem, but it might be worth looking into. Since I replaced my 300W power supply with a 400W, my computer hadn't restarted itself once.