I recently got the Wifi USB connector for X-mas so i can be prepared for SSBB when it launches in Feb. But i keep getting Error code 25140.
The support.Nintendo.com site told me to do a few things. I unhooked all my wireless gadgets, phone & keyboard. I used the wire thingy to get more distance from the computer, sadly the positioning on my computer doesn't really move it away from the computer, but so that its not behind it. The only thing metal near it is the computer itself, and i do not think my Virus protection program would stop it from forming a wireless connection.