How to fix my computer that freezes?

[dyoshmed]

Whenever I'm gaming or browsing, my computer randomly freezes and becomes unresponsive. I can still move the mouse and hear my friends on Discord, but I can't access Task Manager or switch between applications using Alt+Tab. Alt+F4 doesn't work either. The only solution is to restart the PC using the physical restart button. This issue started after I upgraded from Windows 10 to 11, switched my BIOS to UEFI mode, and enabled Secure Boot. I did this because Valorant, one of the games I play, requires Secure Boot to be enabled on Windows 11. If it's off, I can't play the game. Can anyone explain

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