Nintendo attempted to smash the homebrew and piracy scene with system update 4.2 for the Wii. Well if you don’t do either of those then that is not your problem right? Unfortunately the answer is no. Apparently something went wrong and some Wii systems that don’t even have hardware or software modifications are taking a hit and are no longer functioning.
Nintendo has yet to comment on the situation yet, nor have they commented on how wide spread the problem is yet. Unless you really need something off the WiiShop Channel, your best bet would be to wait till this whole thing is sorted out. Hopefully all of you that have already updated still having a working Wii.
Update: If you’re getting Error:003 head here. (Thanks Mega_Mario).