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#11
Windows 7 never has and never will support secure boot. That isn't an ASUS. Not being able to disable secure boot in the UEFI is an ASUS thing, however.
I found this on another forum:
Had the same problem on sabertooth 990fx r2 gen 3 after a bios update on a Windows 7 x64 machine. Strangely, it would happen randomly. Sometimes it would go for days with no problems then it would decide not to boot 4-5 times in a row. Had it set to other OS in bios but secure boot was on. I played around and think I found a solution. Not sure if the sabertooth options will be the same but hopefully they're close enough to help. I enabled UEFI . After enabling, right below, a new option appears: key settings or key management , something to that effect. Click on it and the first option is clear saved keys. Clear them and go back to the previous screen. Switch back to other OS and secure boot should be disabled. Hope this helps!