Well i must say i am very new to this whole modding fallout 3 thing. But i do know how to install mods. There are to ways you could do this. You said you have FOMM. open that up and go to where it says package manager and click it. Go to where it says Add FOmod. a Screen should pop up . go to where your NON extracted mod is and click it twice.it should now appear in the package manager, double click it and it should say installing mod. Your pretty much done with that unless the mod is about textures. you need invalidator placed in your fallout 3/data and activated to use textures. The other way u can install a mod (i wouldnt use this way unless the mod is only a texture or mesh) is you extract the mod to your documents. then go to Computer/ProgramFiles/BethesdaSoftworks/Fallout3/Data. (this is where all the data files are) you then go back to the folder your mod is currently in and drag and drop the textures and meshes to the textures and meshes folders in Computer/ProgramFiles/BethesdaSoftworks/Fallout3/Data, then launch fallout 3 and select the mods you just installed and there you go! thats how you in stall mods For Fallout 3 I hope i have helped