Bra1nT1me

hello, i am completely new to the world of emulators and roms and what not and i have been testing around with them for a little bit, however when i tried to play this morning it said my game cube file was corrupt, i tried everything i could find online even so far as too deleting the gamecube folder from the games folder, however not it is not coming back and i am completely stumped on what to try next, if anyone could walk me through on how to get my launch box up and running again it would be much appreciated