Had problems this morning with my Win 11 machine. I would suspect a MS Win update issue except I have updates turned off, unless one slipped through (some updates get pushed out regardless of settings). It hung bad, couldn't shut it down with task manager. Finally got it to re-start and it worked ok the rest of the session. When I tried to turn the laptop off, it wouldn't allow any of the turn off/restart buttons to work, I had to shut it down with the power switch. I'd guess a conflict between Nikon and MS though Dell might also be involved.