ASUS X541U - task manager is greyed out

[pmenon]

when clicked on the power button the options to restart, sleep, shutdown is not available and task manager option is greyed out. When tried to shut down using alt + f4 it gives out an error message to contact system administrator.

 

[GreyCatz]

You may have to re-install Windows 10. I know you made no mention of the OS, but it does sound like a 'classic' Win10 problem.

Open Settings>Update and security>Recovery and consider the options. They are listed in ascending order of 'severity'. Hopefully, you only need to reset Windows.

Cheers,
GreyCatz.