Not sure if this has been posted before. http://www.makewish.org/site/pp.asp?c=cvLRKaO4E&b=64401 I haven't tested this with GE. This should work if setup correctly though. Seems very kid friendly.
What config app are you using? Setup Wizard or Advanced Config? I know sometimes the path will read D:\GameEx\Vids D:\GameEx\Vids if you click on it twice.
I've added playstaion ports(See Tekken 5 Arcade machine). That way if people don't like the control panel. They can just plug a psx controller and play any game they like with it. Works with all the emu's.