To restore Tabs in File Explorer after Restart in Windows 11, enable the 'Restore previous folder windows at logon' setting in Folder Options.

To run it, search for Disk Cleanup in the Start menu, select the drive with update files (this is usually the C drive), and ...

Perform System Restore At times, a faulty Windows update, a rogue app, or unwanted system changes can cause your Start menu to disappear unexpectedly.