looks like a driver issue but which driver exactly and if its a hardware or software driver is unclear , i suggest youll get the latest chipset/graphic/audio/usb devices drivers (avoid beta drivers) and dont install the nvidia ide driver it have various issues (each log also stores a list of all the loaded drivers at the time, in case you were wonderin) , if youll still have random restarts after having all the latest hardware drivers then it might be a driver of norton antivirus/internet security thats causing it^ check for updates and if that wont help then uninstall it and use avg/avast or nod32 and see if the problem remains