My gaming rig runs 24x7.... BEFORE I broke my SATA HDD, (opps, dont pound fist on your PC)... Anyways, BEFORE it broke, my system would randomly restart every few days, sometimes a few times a day, but I think I had issues with the Win XP installation, because I got random BSOD's also, and random programs would cause failures.... Blizzard updater for WoW wouldn't ever run, but it is running now, and the computer has been running 24 hours a day since I got it back up and running last week.