Now reinstall Fallout New Vegas and DO NOT put it in your Program Files Directory, once installed, boot the game one time and close it out, make sure and do this, you have to boot the game one time to establish the. Now go to Users/?Your User Name?/Documents/My Games and delete the Fallout New Vegas folder, Now go to Users/?Your User Name?/AppData/Local and delete the Fallout New Vegas folder, Now go to Steam and under your game library right click Fallout New Vegas, go to manage, then Uninstall
I recommend everyone do this, it will minimize any problems you may or may not have, Fallout New Vegas should not take very long to download, just take the time to do it right from the start and when modding your game you don't want the game in your program files directory, if you have never modded the game before and you have the game in your Program Directory, just do the Clean Installīefore you start you need to delete all previous Fallout New Vegas folders, especially if you have ever used mods before, they can be left over files you are unaware of that can cause serious hiccups, first open file explorer and go to what ever drive you have your game installed on, go to steam/steamapps/common and delete the Fallout New Vegas folder.