I built a gaming computer about two months ago. It survived a move just fine, and last night I played on it with everything running smoothly. I updated AVG's free security suite and shut down with Windows updates before I went to sleep. When I woke up this morning, the computer started behaving at almost a hundredth of its normal speed, with severe lag and speed issues with even the BIOS. I can't access the BIOS menu, and System Restore is failing to operate. Any recommendations on what else I can do, or will I need to get a new motherboard?