[Deathknight]

Under your connection setup select setup manually and enter all the ips in. If you don't know the ip they're asking for, go into command and type ipconfig/all and that will have pretty much all the numbers you'll need. Tip though, whatever ip address you assign the Wii (it'll ask you for one when you do manual setup, just use the first 3 numbers in default gateway and then enter a number you know won't be used by any other computer in your house), make a DMZ host for that address. I couldn't download stuff onto my Wii until I did that.
Note: I'd give you more detailed information but I'm not at home right now so I don't really have access to give you specifics.