Start your PC then just as Windows loads - press and hold Power Button for 5 - 10 seconds to perform a shut down. Do it 3 times. You may only need to do it twice, but on the third start Windows will boot into the recovery environment.
You can also hold shift > press restart in the start menu to do the same
1:
Go to Troubleshoot > Advanced Option > Startup Repair
This will try to make Windows repair itself.
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Also check the section about Reboot Loop's 3/4ths of the way down: https://www.groovypost.com/howto/fix-most-commo...