Press CTRL, ALT and DELETE simultaneously (CTRL + ALT+ DELETE)
Select Task Manager
Click File
Select Run new task
Check the option that say Create this task with administrative privileges
Type powershell and press Enter
Type Get-AppXPackage -AllUsers |Where-Object {$_.InstallLocation -like “*SystemApps*â€} | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\AppXManifest.xmlâ€} and press Enter
https://appuals.com/taskbar-not-working-on-windows-10/