Wii wireless connection

On your computer Open an Internet explorer and type the router IP address which would be either http://192.168.0.1 or http://192.168.1.1

Look for the SSID and write it down.
Also write down the type of encryption you are using. WAP, WEP, or none.
Also write down the security Passphrase.

Also you will need the IP address, in Windows click on Start, Run and enter 'cmd" in the run box.

At the command line type "ipconfig" and record the IP address

On the wii, You should be able to have the wii look for a Wireless Access Point. If that does not work try the Manual Setup in the Internet Connections menu.

Enter SSID
Enter Type of Encryption.
Enter Security Passphrase
Enter IP address
MTU value is not required. Nintendo recommends 1500 if you are having issues.

http://www.nintendo.com/consumer/systems/wii/en_na/connectingOnline.jsp?entryId=wRouter

Good luck!