And to add to inferno's list. Install Freelancer , actually run it once into the intro to be safe. Install the Mod Manager, open it and close again to be safe. Then install 1.7, close the FLMM down Restart your PC Play the game.
But, did you uninstall the FLMM and completely re-install the FLMM? I ask this, because I did a clean wipe and install last week and I had the same issues, turned out to be the FLMM was corrupt. And the FLMM version has to be 1.3 , not the 1.4.