Keyboard help

[theswaggypoatao]

So I have a .gcm file for super mario sunshine, but whenever I open it and get to the "Press Start" section to begin the game, I try to press enter, but it won't recognize me pressing the key. I went into configuration, and it worked fine, so pls help! Oh and also it won't show up when I open dolphin, so I have to double click it to get it going, in case that matters.