Ryker20031 Try a different mod. If that doesn't help, use a different browser to download a mod. It's possible that your browser is trying to "open" the mods and damaging the files as a result.
If you deleted the Mods folder and a new one was generated the next time you loaded the game, AND that new folder was empty other than the Resource.cfg file, then you're almost certainly working with the correct folder. But please list the full path to that folder (as the game sees it) in case I need to reference it for one reason or another. You can write [username] instead of your actual username if you like.