desktop will not boot up after attempted windows 11 upgrade.

[WDav]

I attempted the windows upgrade from 10 to 11 after which the machine will not boot up.  The upgrade was initiated by clicking on an icon located on the taskbar.  When unit attempted to restart after upgrade, the following happens:

Asked to "choose keyboard layout", "choose an option", "troubleshoot (reset PC or see advanced options), "Turn off your PC", "Advanced Options", "Startup Repair", says diagnosing = Couldn't Repair, Shut Down.  I tried "System Restore" response is "To use System Restore, you must specify which Windows installation to restore.  Restart this computer, select an operating system and then select System Restore".

I am unable to get to "System Restore".

[BeemerBiker]

You mention there was an icon on taskbar you used.  I assume your system is approved for win11 as the CPU in your 590 spec is one of the listed CPUs

Did you run the Microsoft health app?  Did you pass?  Did you run tpm.msc and take ownership of TPM?   

I had a major problem updating to win11 and had even cloned the C drive ahead of time in case something went wrong.

When things went wrong, did you make any change in the BIOS ?

I assume you had "restore points" enabled for the C drive as the defaults for 10 is enable restore.  You should be able to boot a win10 USB or DVD and find the OS and select a restore point.  If the USB or DVD does not show up as a bootable device you may have to temporarily disable secure boot (I had to do this).

In worse case you can download the full OEM install of windows 11 (except for enterprise) using another system and do a clean install.

I was able to get win11 to work by looking at my event log (after the failed upgrade) and getting rid of any packages that were causing problems.  Doing a clean install was not an option for me unfortunately.