Community Manager
My guess is that you have Secure Boot disabled?
From latest bf2042 update
Secure Boot
With Update 8.8.0 on Battlefield 2042, we will be requiring that Secure Boot is enabled for PC hardware that can support it, in order to provide you with a higher standard of trust and safety whilst you play select EA titles. As cheat developers keep evolving their tactics, we're stepping up our game too. To keep Battlefield 2042 fair and fun for everyone, we're strengthening our defenses—especially against cheats that try to sneak in during the Windows boot process. This move supports our Positive Play commitment and helps ensure a level playing field for all players. If you attempt to load the game following Update 8.8.0 without Secure Boot enabled, but are on a piece of hardware that supports it, you will be prompted with a message stating that Secure Boot is required. Secure Boot is a feature that is available for Windows 11 and Windows 10 devices, and you’re able to learn more about how to enable this functionality via our EA Help article here.
also you are not alone:
https://forums.ea.com/discussions/battlefield-2042-technical-issues-en/security-violation-c-111/12215206
as i mentioned here
