[B]STOP: 0x00000060/B] This is a general hardware fault. Without the actual .dmp files its hard to pinpoint the actual problem, but you can do the following..

Check for Defective Hardware... Confirm the hardware is working correctly using a hardware diagnostic program. If you suspect a specific hardware item, such as memory stick or video card, try replacing it with known good hardware.

Don't overlook the possibility that hardware was not installed correctly, especially anything you installed just prior to the problems starting. Make sure all cards and memory are securely seated in their slots. Verify disk drive cables are properly connected and are not loose.