Just got high speed internet yesterday, and have had nothing but grief with the Wii so far.
I have a D-Link DIR-615 wireless router and I've been trying to play Mario Kart for more than 2 hours without completing a race!
I get the 91010 error all the time, I get the 86420 error all the time, I get random dropping all the time.
Any ideas? I moved the router and the wii so they were within 10 feet of each other and no impovement.
The Wii shows a good connection, and I've been able to download demos from the online channel, and I can surf the net on the Wii, but damned if I can play my Mario Kart Online.
I tried disabling the firewall, I'm currently running the router wide open, I've tried changing the channel to 1 or 11, nothing seems to work!