Thank you, as I looked into this, it's "sign in options" that I can't access, and not Security. (Did I mention I'm running Windows10 and not 11?) It will give me the options tab, and I can access other tabs in the window, but any means I use to access "sign in" options makes that window go blue with the white "settings" gear icon, and then does nothing.
I wouldn't say it freezes or crashes, I've not had to use task manager to force it to close.
I wonder if there is anything in the BIOS that needs to be set to sync up or something.