We used a different card reader and reformatted (for what has felt like the 50 billionth time lol) the SD card to Fat32. And yay it worked. :)
Thank you for your help.
Just a question though, and I don't know if this has been answered in the thread or if it's really an issue, but what should we do if we were to buy a game that forced us to update the Wii. (ie Skyward Sword when it comes out, considering there's been rumors that it will force a system update)