We need a bit more to go on. However, I will answer your question as generally as it is asked. 1.Make sure you have the latest 4in1 drivers from VIA (I think 4.37 is the latest version. 2.Make sure the RAM settings are at their slowest before installing any hardware. If the system runs stable, gradually tweak until unstable. 3.Make sure there are no issues with regard to your BIOS. Download and install the latest BIOS if necessary. 4.Make sure you have a decent power supply. At least 20 amps on the 3.3 volt line. 5.Make sure your processor is being cooled adequately. If it is approaching the 60 degrees C mark you are inviting crashes. 6.Make sure you have decent RAM. If you have 2 DIMMS see how it works with 1. If it still crashes, try the other. If I can think of anything else, I'll get back to you.