the game needs to dl a mandatory update b4 you can play online. recently bought a 2nd wii just so my wife could play blk ops and we wouldnt have to take turns anymore, and we had an issue setting it up the first time. for some reason the update wouldnt pop up. It just kept saying loading and the circle would spin.
what i did was instead of choosing multiplayer, i then went into the online zombies mode and it will tell you ya need the update and automatically boot you to the online multiplayer screen and receive the update. it actually took two tries to get the update to run, but after that I've had zero problems.
for some reason it seems as if you are setting up the multiplayer since the original patch update...it doesn't want to find the update easily. my original wii had no problem doing the original update when it released but the new one had a problem finding the update after the 2nd pacth had already been released.
gl, i hope that going into the online zombie mode will trigger the patch dl for you liek it did for me.