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SYSTEM_THREAD_EXCEPTION_NOT_HANDLED

A system thread crashed, almost always because of a driver. Graphics drivers are the top cause.

How to fix it

1. Boot into Safe Mode if Windows will not start (Advanced startup > Troubleshoot > Advanced options > Startup Settings > 4).
2. Roll back or reinstall the graphics driver. Display Driver Uninstaller (DDU) in Safe Mode gives the cleanest result.
3. Update other drivers, especially any named on the blue screen.

Is it serious?

Fixable with a clean driver install.