@exoteric: My bosses computer is running XP, so I had to go back to .NET 4.0 as XP does not run .NET 4.5.

I wouldn't even venture to suggest that we don't support XP, because I know what the answer will be. The app is a typical forms over data application, and is the effort of 3 guys. Lots of forms and database stuff. Typically before people did what Office was doing i.e. use a Ribbon, but that is old fashioned now