Set your MBR to zero
DISCLAIMER: This program is not safe. It will overwrite your MBR and make your computer unbootable. DO NOT TRY THIS ON YOUR HOST MACHINE. YOU HAVE BEEN WARNED.
How to use? To download this, go to bin/Release and download the MBRZero.exe. Run it then it will set your MBR to 0 so the computer can't boot anymore.
How to repair? First, boot into the Windows Installation on your USB (Rufus needed, https://github.com/GrumpBoatYT/Programs/blob/master/software/Rufus.7z archive password is grumpboat). Then click on Next. Then click on Repair your computer. Then run a startup repair. Restart and your computer is fixed!
Code difficulty: Easy
Malicious: Yes