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KMODE_EXCEPTION_NOT_HANDLED

A driver caused an error Windows could not handle.

How to fix it

1. Note the .sys file on the blue screen and update or remove that driver.
2. Turn off Fast Startup: Control Panel > Power Options > Choose what the power buttons do > uncheck "Turn on fast startup".
3. Update network and graphics drivers.

Is it serious?

A driver fix in most cases.