whats wrong with my zdoom

ok i always have a problem with my zdoom like i start it up and it says fmod.dll was not found and a bunch of other shit and then i downloaded the zdoom launcher and it wont even let me put any mods into that game whats goin oN>>>?????

If it says that it can't find fmod.dll it means that it can't find fmod.dll. Get it either from fmod.org or from 47.cab.