Windows stopped with a KERNEL_SECURITY_CHECK_FAILURE (bug check 0x00000139) because a kernel-level security check detected that data structures have been corrupted. This is a protective stop — Windows intentionally halts execution when it detects kernel memory corruption that could allow a security bypass or system compromise.
Faulty RAM is corrupting kernel data structures, triggering the security check.
A kernel-mode driver has a memory corruption bug — writing past allocation boundaries or using freed memory.
A third-party kernel-level application (antivirus, anti-cheat, virtualisation software) is corrupting kernel structures.
Corrupted Windows system files are causing kernel integrity checks to fail.
CPU overclocking or memory running outside spec is causing random bit corruption in kernel structures.
How to fix it
Run MemTest86 from a USB boot to check for faulty RAM. Any errors require replacing the faulty module.
Disable all overclocking and run memory at its default JEDEC speed. Disable XMP/EXPO profiles as a diagnostic step.
Run `sfc /scannow` and `DISM /Online /Cleanup-Image /RestoreHealth` in an elevated Command Prompt to repair Windows system files.
Analyse the minidump to identify the driver involved. Update or remove the identified driver.
Uninstall third-party kernel-level software (antivirus, anti-cheat engines like Vanguard or EasyAntiCheat, virtualisation tools) and test whether the crashes stop.
Enable Driver Verifier (`verifier.exe`) targeting non-Microsoft drivers to identify the specific driver causing the corruption.
Update all device drivers, especially those that interact deeply with the kernel (GPU, storage, network).
