I recently just upgraded my Windows 7 32 bit to a 64 bit version and installed a 8GB RAM card as i said in my title. Yesterday my PC restarted, and i did not know the cause. Today it happened again and I was checking on why it auto restarts just suddenly when i am using it. According to windows forum, it is the cause of a System Failure and they asked me to uncheck the "Automatic Restart" tab. And I did, and now my WIndows is showing 6GB RAM (3.25 Usable). What does this mean? Is the hardware damaged? Or is it a software issue?