No guarantees but I posted this suggestion earlier for a slightly different problem, but see if it works for you. It seems as though the "upgrade" process may not install all the files correctly, or maybe they're damaged, or maybe something else, but running Chkdsk has fixed quite a few of these minor glitches. Try running Chkdsk in "repair" mode to find any damaged files and correct them. Start by opening a command prompt as an admin. RIGHT click on the Start button, choose "Command Prompt (Admin). Once there, type chkdsk /f /r /x, leaving the appropriate spaces between the letters as shown, then press the Enter key. You should see a note that it can't be run till a restart is done, type "Y" for yes, then press the Enter key again. Close the command prompt and restart the computer. Chkdsk will run upon restart and will take quite a while to finish.. Don't panic when the progress bar stays at 10% for a long time. It's fairly normal and the Chkdsk process may take a couple of hours.
When it's finished, it will boot to your normal startup/lock screen and you can login normally.
Hope this helps.
Suddenly I can't create a folder within an existing folder, when I could before now. Clicking on the folder icon at the top of an open folder hangs up File Explorer, as does right-clicking within an open folder. Oddly enough, I CAN create a new folder on the desktop, which I can then drag into an open folder, to create a sub-folder. If this is addressed elsewhere within this forum, please let me know.