I don't mean to speak badly of the sites you use for mods, but there are really no safe sites. Anything that's not made by Electronic Arts has the potential to really mess up your game. I'm going to remove the specific names from your post because we don't allow that specific information to be posted.
Have you done a complete uninstall/reinstall of the games and expansion/stuff packs? It would probably solve some of your problems. We have lots of information on the Technical Help board to help you save your game files and successfully reinstall the game.