Main Camera flys away.

Extreme Newbie I open my file and it says Scene is missing a fullscreen camera. When I hit PLAY the camera drops in then looks as if it is going down to the water layer then rebounds back up and moves far away. The original default fly-in has been corrupted in some way. Any help. This happened after I attempted to set a First Person Controller then deleted it. After that my main character (attached under the 3rd Person controller started doing backflips so I deleted and re-imported and re-attached to 3rd person controller but on PLAY the wierd stuff happens with the fly in. I had chosen a Smooth follow script and assigned the Third Person CTRL as the Target for the follow. HELP!