IMPORTANT!! I forgot to add one last cleanup step, find the file es_systems.cfg located at: \RETROPIE\configs\all\emulationstation – You will need to remove the megadrive entry, just delete that highlight text and save.
Type this into SSH (Putty) to remove symlink:
sudo rm /home/pi/RetroPie/roms/genesis/megadrive
Also, type this to access RetroPie Setup:
Get the Easy Hax RetroPie Toolkit HERE
Shout outs to Arcade Punks, for hosting roms, video snaps, and pre-garbage…. errr, i mean pre-made images, lol!