Most mods should have either installation instructions in the description or a readme file, but heres how to install most mods: Download the compressed file onto your computer Uncompress that file Move any files in the uncompressed folder to the data folder of New Vegas default directory path for 32 bit machines: C:\Program Files\Steam\SteamApps\common\fallout new vegas\data default directory path for 64 bit machines: C:\Program Files (x86)\Steam\SteamApps\common\fallout new vegas\data If there are any folders in the uncompressed folder such as "meshes" or "textures", copy the entire folder into the NV data folder as well Run FalloutNVLauncher.exe default directory path for 32 bit machines: C:\Program Files\Steam\SteamApps\common\fallout new vegas default directory path for 64 bit machines: C:\Program Files (x86)\Steam\SteamApps\common\fallout new vegas When the splash screen loads click data files and make sure there is a check mark next to all the items listed, then close that window You are now ready to play and enjoy New Vegas with whatever mods you choose to install.