As I posted in your last thread on this subject http://www.wiichat.com/nintendo-wii-...tml#post170364
yes. Have you removed any mac filtering, set it to mixed mode, provided the correct WEP key, brodcast SSID etc.
Just remove all your security, get it working and add it back a layer at time.
I switched my wii on, added the connection info, tested it and updated. It took 5 minutes or less.