Got it up and running on second try What I removed from the windows 10 startup.  I was not sure exactly what might be causing the problem so I took out anything I thought I could do without       What I uninstalled     What I should have uninstalled  All NVidia drivers for my RTX2080 as the win11 took then out completely after a lot of error messages ============= What I put back in     Tested as good the following       Have not decided if the icloud HP and Adobe are needed or not.
Bad start: Ordered replacement hard drive so I could try 11 and easily go back.  Disk drive was scam or stolen by post office. Bought another drive locally. Used Acronis to clone.  Swapped drives, booted and started the upgrade.  Went out to eat during the actual install but got back only in time to see the upgrade was reverting back to windows 10. Looked at Event Viewer and tried to fix the problems by uninstalling the devices the win 11 upgrade reported it had problems with: Uninstalled all XBOX.  Do not even have one.  XBOX bar was grayed out had to google how to uninstall. Uninstalled Intel rapid technology and intel iastore drivers that were old duplicates.  I left the newer iastore drives in.  Had to use revo uninstaller as the older iastore were missing the uninstall ap; Summery of what happened top down is Nov 17 bottom is Nov 16 looking at event logs:           After making changes (uninstalls) the system would not boot and Alienware boot tried to do a lot of fixing, recovering and all the microsoft recovery selections showed up. I put the original hard drive back in and same problem, windows did not boot and the same boot fixing was attempted by Alienware or Microsoft.  I have no idea why the original disk did not boot up. I put the new disk back in as I did not want to have the original fooled with by the bios or Microsoft and after an hour or trying I managed to boot the new disk (not the original) after disabling secure boot and enabling legacy. My bios has been set to use AHCI and not that intel rapid technology.  The M.2 has 256gb that is used by PrimoCache to speed up all other drives.  I had pulled other drives out before trying win11 upgrade. What I am going to do:  Remove all startups that are unnecessary, disable primo cache and try again.
Area-51 R4, Windows 11 disaster