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KERNEL_SECURITY_CHECK_FAILURE

Windows detected corrupted data in the kernel. Usually an incompatible driver, sometimes RAM or disk errors.

How to fix it

1. Update all drivers, especially after a Windows upgrade.
2. Open Command Prompt as administrator (search "cmd", right-click, Run as administrator).
3. Run: DISM /Online /Cleanup-Image /RestoreHealth and wait for it to finish (it can sit at 20% for a while).
4. Then run: sfc /scannow
5. Restart the PC.
6. Run chkdsk C: /scan and a memory test.

Is it serious?

Software in most cases.