Installed Windows 11 on Dell XPS8930 today. Seemed to go OK until user logon. After 20 seconds the screen went black and then I was thrown back to the user logon screen. Logged on again and everything was as it should be, but 20 seconds later the same problem again. Didn't make any difference which user logged on; same problem. Eventually reset the computer to previous Windows 10 version. Anyone else had this problem?