vegas 12

Hi guys, recently my computer has been crashing (Sometimes with a blue screen sometimes without one) when rendering videos in any format..please help! My computer specs EVGA FTW GTX 670 AMD 8-core FX8120 3.6 GHZ CPU(OC'ed to 3.6) 8gb of RAM Rosewill HIVE Series HIVE-650 650W Power Supply...