Error codes

0x00000139

KERNEL_SECURITY_CHECK_FAILURE

What it means

Windows found that an important data structure was corrupted and stopped before it could cause damage.

Common causes

• Incompatible drivers
• Faulty RAM
• Damaged system files

How to fix it

1. Open the crash dump in WhoCrashed or BlueScreenView: it usually names the driver file that caused it (for example nvlddmkm.sys is the NVIDIA driver).
2. Update the graphics, chipset and network drivers from the maker's site (NVIDIA, AMD, Intel or your board vendor), not from a driver-updater tool.
3. Open Terminal (Admin) and run sfc /scannow, then DISM /Online /Cleanup-Image /RestoreHealth. Restart afterwards.
4. Test the RAM: run Windows Memory Diagnostic (search mdsched) or MemTest86 from a USB stick. Any error means a stick or its speed setting is the problem.