Well, did you create a backup before you started plopping mods into the game for 0.3? If you didn't make a backup then you need to google GTA V stock folder and compare and delete what needs to be deleted and then install 0.4 and you should be good to go! Always make game backups before installing mods!
Or just look at the images I posted!
Also don't forget to delete dinput8.dll, openCameraV.asi, and OpenIV.asi you don't have to but if you want to play regular GTA Online you have to!