I like to connect to Nintendo Wi-Fi, and this is the easiest way to find out your WEP key.
Also, this is my first Instructable* so please feel free to comment.
*Actually I was thinking of making a battery drainer but the battery holder unfortunately melted while I was soldering.
Step 1: Go to the Control Panel!!!
Go to the control panel and double-click the "Wireless set-up wizard" (or something like that).