Error 51330 after system update?

I picked up Mario Galaxy the other day and decided to play my Wii for the first time in a month or so. It downloaded a system update automatically, and now it gets error 51330 when trying to access any internet related functions. Nothing has changed on the router, and I have other wireless devices that are able to connect fine. I use WPA TKIP and have tried putting in the preshared key again, but it doesn't seem to make a difference.

Any suggestions on how to resolve this issue?

I'm gonna hazard a guess at, you've got two differant setups of router's
when you update it will try to connect to whatever is in slot 1 of the internet setting's, as for some reason it resets to that

check it's selected properly
if that isn't it, just delete the settings and connect the wii t it again

This happened to me too.

Do you have more than one connection option on the internet connection menu?

Here's what happened to me: I started out using the wifi usb adapter and set that as connection 1. A few months later I got a real router and set the router as connection two and put the usb adapter into storage. When I updated my system, my Wii apparently reset my connection settings to connection 1 which was no longer available. So all I had to do was set the connection setting back to connection 2 and all was right with the world. (By the way, this took me about 3 days to figure out on my own)

Hopefully that helps. If not, that's all I got!