My windows 11 PC has reverted to what looks like windows 10 and start menu is not working

[Microsoft Windows]

My PC has had windows 11 installed from new, never had windows 10 to my knowledege. Following a restart today it appears to be running Windows 11 and the start menu is not working. Trying to launch settings or windows defender or other desktop shortcuts returns this message; "There’s a problem with Windows Shell Experience Host. Refreshing your PC might to help fix it."I am able to launch run command via windows r, file explorer with windows e and also able to launch browsers from the desktop

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