Run DISM command and SFC utility that scans windows 10 for missing corrupted files if found any the utility automatically restores them. Especially while the windows 10 upgrade process, if any system file goes missing, corrupted you may encounter different problems that include the start menu and Taskbar not working.
Start windows into clean boot state that disable all non-Microsoft services and help you to find out if any File Explorer addon is interfering with the smooth functioning of explorer.exe which causes windows 10 start menu and Taskmanager not working.
For most of the users face “ auto-hide” functionality of the Windows 10 Taskbar can sometimes stop working, Restarting Windows explorer helps them to fix the problem.
