If you are currently stuck on the loading screen, don't reformat your PC. Do this:
Since Vanguard enforced this, the game feels cleaner. You aren't getting one-tapped through smokes by a level 2 Reyna with a username of random keyboard smashes.
BIOS Mode must be UEFI and Secure Boot State must be On . Step 2: Access Your BIOS/UEFI Settings
But here is the hard truth: In the arms race between developers and hackers, the era of "plug and play" is over. Secure Boot is the new standard for competitive gaming. Call of Duty requires it. Fortnite requires it. Soon, everything will.