How do I reset the task manager to default settings?

The task manager doesen't have the tabs or the menus across the top of it like it used to have. and when I bring it up I can't close it out I have to restart my computer to get rid of it. in other words I can't use it anymore How do I set it back to the default settings?
Update: Martinmm That didn't work its still the same way. Thanks for trying
6 answers 6