A computer running Windows 8.1, Windows 7 Service Pack 1 (SP1), or Server 2012 R2 may encounter the Unexpected Kernel Mode Trap error.

This error is generally triggered by issues occurring in kernel mode. Specifically, it arises when the CPU encounters a condition that the kernel cannot handle or when the system faces a fatal, unrecoverable error.

The primary culprit is often hardware malfunction, especially defective or incompatible RAM.

In some cases, problematic software installed on the system can also trigger this error. This error code existed prior to Windows 8; starting with Windows 8, it was officially labeled as UNEXPECTED_KERNEL_MODE_TRAP.

Unexpected Kernel Mode Trap

Several factors can lead to this error. The most frequent cause is a failing RAM module that intermittently causes read or write failures. If this is the root issue, you’ll need to run a system scan and replace the defective RAM stick. Another possible cause is outdated or corrupted drivers. Occasionally, one or more device drivers may be misconfigured, damaged, or not updated. You may notice this issue after a Windows update or when reverting from a newer operating system to an older one, especially if you're using an outdated version of Windows.

System Messages Associated with Unexpected Kernel Trap

Prior to Windows 8

A critical error has been detected and Windows has shut down to avoid damaging your computer.

If this is your first time seeing this Stop error screen, restart your computer. If the screen appears again, follow these steps:

Ensure you have sufficient disk space. If a driver is mentioned in the Stop message, try disabling it or check the manufacturer’s website for updated drivers. Consider switching your video card.

Contact your hardware provider for any available BIOS upgrades. Turn off BIOS memory settings like caching or shadowing. If Safe Mode is needed to remove or disable components, restart the computer, press F8 to access Advanced Startup Options, and then choose Safe Mode.

Technical information:

*** STOP: 0x0000007F (0x0000000000, 0x0000000000)

### Starting with Windows 8

Your PC encountered a problem and must restart. We’re collecting error details and will restart automatically for you. (0% complete)

For more information, you can search online later using this error: UNEXPECTED KERNEL MODE TRAP

How to Resolve Unexpected Kernel Mode Trap or Error Code

• If the error occurs shortly after installing new hardware, the hardware is likely the cause. To fix it, remove the newly added hardware and restart your PC. If the issue started after installing a driver for the new hardware, uninstall the recently added drivers to identify the problematic one.

If the 0x0000007F error appears right after installing new RAM, power down your computer, remove the RAM module, restart, and check if the problem persists.

If faulty RAM is suspected, use the Windows Memory Diagnostic Tool to test your memory. Here’s how:

1. Click Start
2. Type Memory Diagnostics Tool in the search bar
3. Right-click on Memory Diagnostics Tool
4. Select Run as Administrator
5. Follow the on-screen instructions to begin the diagnostic

How to Uninstall Drivers

To determine if a corrupted driver is causing the issue, perform an automatic driver update or manually update drivers to their latest versions.

To manually update a driver, follow these steps:

1. Click Start
2. Type devmgmt.msc in the search box
3. Click devmgmt from the results
4. Right-click the device driver
5. Choose Update Driver Software to update
6. Select Disable to disable the driver
7. Choose Uninstall to remove the driver

Automatic Driver Update:

1. Click Start
2. Navigate to Devices and Printers
3. Right-click your computer’s name
4. Click Device Installation Settings
5. Choose Yes, do this automatically
6. Click Save Changes
7. Proceed with the recommended steps to complete the process

Consider turning off memory caching in BIOS. To do so, restart your computer and press F2 or DEL to enter BIOS. Navigate to the Advanced Menu, locate Cache Memory, and set it to DISABLE. Press F10 to Save and Exit, confirming your changes.

The Unexpected Kernel Mode Trap or error code 0x0000007F can severely disrupt your computer’s performance and cause significant frustration. It's crucial to resolve the issue promptly. The solutions listed above should help eliminate the problem.

Conclusion

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