That stop code (dependant on the second group) points to hardware
This error message can occur if either of the following conditions exists:
•Your computer has hardware or software problems (hardware failure is the most common cause).
•You try to over clock the speed of your computer's processor (for example, you set a 150 MhZ processor to run at 187 MhZ).
The above STOP error means a trap occurred in kernel mode and the trap is either one the kernel is not allowed to have or is always fatal.
The most common causes of a STOP 0x7F are:
•Low-level hardware corruption, such as corrupt memory (RAM)
•Mismatched memory modules
•A malfunctioning motherboard
To determine an approximate cause, examine the parameters at the top of the STOP screen:
**STOP 0x0000007F (0x000000XX, 0x00000000, 0x00000000, 0x00000000)
UNEXPECTED_KERNEL_MODE_TRAP
The most important parameter is the first one (0x0000000X) which may have several different values. The cause of this trap can vary, depending on the value of this parameter. All traps that cause a STOP 0x7F can be found in any Intel x86 microprocessor reference manual as they are specific to the x86 platform. Here are some of the most common ones:
Values Meaning
0x00000000 Divide by Zero Error
0x00000004 Overflow
0x00000005 Bounds Check Fault
0x00000006 Invalid Opcode
0x00000008 Double Fault
http://support.microsoft.com/kb/137539