Thank you very much. Stupid of me not to think of the BIOS, which I changed several times on other systems but that's a long, long time ago. Anyway, I did not touch the BIOS this time, it must have happened during the W10 to W11 upgrade because this window never appeared in W10 or earlier Windows versions. I am not sure about the best approach: I have already changed the boot sequence from #1 (OS) to #2 (UEFI) but the password window still appears. My BIOS now has Set Admin PW Installed, Admin PW Not installed, and PW Check [Always]. When I try to change PW Check it only highlights I/O Interface Security. Any suggestions?
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