Press Ctrl + Shift + Esc to open Task Manager.
Find and select Windows Explorer in the list.
Click on Restart.
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Right-click on the taskbar and select Taskbar settings.
Ensure the taskbar is not set to automatically hide. Toggle Automatically hide the taskbar off if it's enabled.
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Create a New User Account and recheck.
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Open Command Prompt as Admin and type the following command followed by hitting the Enter key:
sfc /scannow