General causes of “STOP 0×0000007F” errors

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 0×7F 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 0×0000007F (0×000000XX, 0×00000000, 0×00000000, 0×00000000)
UNEXPECTED_KERNEL_MODE_TRAP

The most important parameter is the first one (0×0000000X) 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 0×7F 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
———-                ——————–
0×00000000   Divide by Zero Error
0×00000004   Overflow
0×00000005   Bounds Check Fault
0×00000006   Invalid Opcode
0×00000008   Double Fault

To resolve this issue, use the appropriate method:

* If either software or hardware can cause a particular trap, a debug is required to determine which is the cause. If you suspect a hardware problem, try the following hardware troubleshooting steps:
1. Test the RAM in the computer by running the diagnostic software that is provided by the computer manufacturer. Replace any RAM that is reported as bad. Also, make sure that all the RAM in the computer is the same speed.
2. Try removing or swapping out controllers, cards, or other peripherals.
3. Try a different motherboard on the computer.
* If you are over clocking the speed of your processor, set it back to the speed at which it is designed to run.
* Check with the hardware vendor for any updated hardware drivers or BIOS updates, or both.

For more information on processor faults, consult Microsoft technical support executive.

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