Can anyone solve my simple Computer Issue? HELP!

Ok I have a HP Pavilion entertainment PC whatever that means! I don’t know shit about computers Anyway a couple days ago I must have pressed a key or something because now when ever I have my internet up the bar at the bottom showing all of my windows I have open, the time, battery status, ect. is not showing up it just has the bar that displays when a page is loading. Can anyone please tell me what to do it is driving me crazy! PS I have restarted it and turned it off and it is still there