Minidumps are not usefull unless you have a strong background in writing windows device drivers, they are generated so they can be sent to the companies involved for troubleshooting.
You did say the 'system just rebooted' no error message, but your getting mini-dumps. Go in and turn off the 'automatically reboot' option so you can see the blue screen. Try your scan a couple of times and lets see if it's always the same driver that is responsible for the crash (various drivers would point more to a hardware/heat problem, the same one over and over would tend to point towards it or just it's associated hardware)
Bill
