Hello,
Sorry to hear you are having issues. But, I can't recreate your issue. I have setup my Windows 10 as what you mentioned above. Except

Not sure where is that option, I don't have that option on my system, or is that somewhere else?

And this is what I get.

1) Startbutton left click : Windows 10 menu

2) Left Windows keys show Start10 menu, I don't have right Windows key to test what that will do.

3) Right click on StartButton : Win+X menu.

Need to know more.

1) Windows 10 full version numbers. Please use Winver.exe for full Windows 10 version numbers.

2) Start10 version.

Thanks

Basj,
Stardock Community Assistant.

Hello,

Please try the following:

-For Win8/10 Users: Open the Start Screen, and type 'cmd'. Right-click on the search result and select 'Run as administrator' from below.

-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.