Access Denied - User

So, I was having issues launching Steam.  So I decided to check if it was something to do with my firewall.  Upon clicking on "Manage Firewall" the window came up and then went unresponsive.  I could not close it via task manager so I restarted my computer.  Upon opening it again it says "Access Denied: A different Windows user account is configuring Norton 360. You cannot configure Norton 360 at the same time."  Now I don't know what to do. :I

Any help would be apreciated, Thanks!