Run the Start menu troubleshooter:
http://aka.ms/diag_StartMenu
If that does not work, try the following:
Press Windows key + X
Click Task Manager
Click File > New Task (Run)
Type: CMD
Hold down Shift, click OK
Type in at the prompt OR Copy and Paste these one at a time : (Hit enter after each)
Dism /Online /Cleanup-Image /CheckHealth
Dism /Online /Cleanup-Image /ScanHealth
Dism /Online /Cleanup-Image /RestoreHealth
Also run the System File Checker utility:
Press Windows key + X
Click Task Manager
Click File > New Task (Run)
Type: CMD
Hold down Shift, click OK
At the Command Prompt, type: sfc/scannow
This will check for any integrity violations
Restart your system
If that does not work, uninstall your display driver.
Boot to the Windows 10 desktop
Press Windows key + X
Click Device Manager
Expand Display adapters
Right click the current display adapter
Click Uninstall
Exit Device Manager
Restart
Windows 10 will automatically reinstall it.
If the above don't work, you have one of two options:
Option 1: perform a repair upgrade to see it repairs the Start menu:
http://answers.microsoft.com/en-us/insider/wiki...
Option 2: Rollback to your previous version of Windows 10:
I'm not surprised you are having trouble with Windows 10 Fall Creators Update.
There seems to be some early adopter issues at this time with Windows 10 1709, if you can, I recommend you downgrade to your previous version until the Fall Creators Update matures with future cumulative updates.
Open Start > Settings > Update & security > Recovery > under Go back to my previous version of Windows 10, click Get started.