KnightNight

I'm new to both Launchbox and MAME, so to set everything up I went by these videos. However, none of the games seem to run. Whenever I double click on a game in Launchbox it shows a initializing screen, then shows the progress at either 59% or 79% before closing out of the initializing screen entirely leaving me in the Launchbox menu. I tried to run the roms on MAME itself, but that doesn't work either. They just show the error "The selected machine is missing one or more required ROM or CHD images. Please select a different machine." I also tried adding some other ROMS I wanted to play (Marvel Superheros and Marvel VS Capcon 2 New Age of Heros) these also didn't work. I also got them from CoolRom.com.