First, if you also have black user image on Windows default start panel, than it is not Start11 issue. It is more likely Windows account issue. Please try using this steps to check you Windows system.
Please try the following:
-For Win10/11 Users: Open the Start Screen, and type 'cmd'. Right-click on the search result and select 'Run as administrator' from below.
-For 7 Users: click Start, in the start search field type 'cmd'. Right-click on the search result and select 'Run as administrator'.
-Type: sfc /scannow
-Wait for the scan to complete (this can take several minutes)
Some help on how this looks should you need it:
https://support.microsoft.com/en-us/help/929833/use-the-system-file-checker-tool-to-repair-missing-or-corrupted-system
If the SFC finds errors, but cannot fix them, please also run the following command in the same command prompt window:
dism.exe /online /Cleanup-Image /RestoreHealth
Some help on how this looks should you need it:
https://www.windowscentral.com/how-use-dism-command-line-utility-repair-windows-10-image
The above command should assist with replacing any damaged or problematic system files. Please note, however, since it may require restoring certain files, this process can take some time and you will need to be patient until it has completed.
Please let me know whether this resolves your problem or if you have any additional questions.
Thank you,
Basj,
Stardock Community Assistant
