After installation Windows 11 boots instead

No, it still boots straight into Windows 11 . I can only get here (manjaro) by holding F3 to get into bios. This is disheartening to say the least. I guess the system is corrupt. I seen in another thread about updating mirrors to stop message “invalid or corrupt package” that I receive when trying to install either 1 or the entire 900 updates my system needs, it did not go too well either. if interested read here - Invalid or corrupt updates
Would you have any idea the best way to totally remove this install without affecting my dual boot windows 11? I am afraid there is some kind of virus in the Manjaro install as nothing seems to work like it should.