This problem was caused by my stupidity.

I attempted to create a mod, basing it on a multiplayer one that alters the starting point in the game. I wanted to edit it a little and make it so the starting point and starting money got changed. So I altered it and saved it as "Imp. Outcast Mod" in my FLMM. I activated it, started a LAN server, and tried to join. The game wouldn't let me on though, it kept saying that the server was experiencing errors. I shut down Freelancer and the server, and then I tried to start up a new server but the same problem happened. I figured I screwed up my mod so I deactivated it (after shuting down the game and the server). Unfortunatly, I can nvr start up Freelancer anymore. Whenever I start the game, even without any mods, it ends the program as soon as it gets past the credits.

Is there anything I can do to return my game to normal?