area51m cant disable secure boot

It's usually under the Boot or Security sections of the BIOS interface, but since I don't have an Area 51m, I can't check that myself. However, the only reason you should need to disable Secure Boot would be if the software you're installing needs to modify or replace the Windows bootloader, and typical software should not need to do that.  The only immediate software I can think of that might need this would be custom boot managers like GRUB and possibly some whole disk encryption solutions.  Secure Boot is a useful anti-rootkit mechanism because it will alert you if your bootloader is ever tampered with, but disabling it will remove that protection/alerting mechanism.  So if you haven't already, make sure you understand exactly why the software you want to use needs to modify the Windows bootloader, that you're ok with removing that protection in order to use it, and most importantly that you trust the software vendor, because disabling Secure Boot would allow a nefarious software vendor to do some malicious things on your system that would be difficult or impossible for anti-virus running within the OS to detect.

Hi @yixuan

Enter the BIOS, go to Boot Tab > Secure Boot.