If it's just the Start Menu that's acting up, it can be from a single windows update; this windows update below might be where it came from, or more steps might be needed to fix this. I would try this one first, ... if you have the update KB4517389 installed. Uninstalling can fix this issue... here's how,
How to fix Start menu critical errors after updating to KB4517389
To uninstall Windows 10 update KB4517389 and resolve related problems with the Start menu, use these steps:
- Open Settings.
Quick tip: As a result of the Start menu being broken, you can open the Settings app using the Windows key + I keyboard shortcut. Alternatively, you can right-click the desktop and select the Display settings or Personalize option. Or if available, right-click the Start menu, and select the Settings option or right-click the taskbar and select the Taskbar settings option.
- Click on Update & Security.
- Click on Windows Update.
- Click the View update history option.
- Click the Uninstall updates option.
- Select the "Update for Microsoft Windows (KB4517389)" item.
- Click the Uninstall button.
- Click the Yes button.
- Click the Restart Now button.
Once you complete these steps, your device will revert to the previous version, fixing any issues you may have experienced with the Start menu.
This may or may not be the solution, but I figure it could be worth trying...
Here's a link to Microsoft help site, on Start button not working.
Windows 10 start button not working
Also a nice link from helpdeskgeek, and
What to Do If Your Windows 10 Start Menu Doesn’t Work?
Lastly, a Youtube Windows 10 Start fix video, but I have not watched the video, so proceed with caution.