Okay, here is part of your problem: You didn't get a virus in the normal sense, you got social engineered. Nothing was automatically installed on your computer, you clicked a link and ran an .exe or installer yourself manually. Many anti-virus programs are not good at dealing with that circumstance.
I don't even think Norton scans IMs.
Did you have windows defender installed? That might have caught at least some of it. Norton will likely get rid of the damage, but you are going to have to run something like spybot S&D or similar to get rid of the annoying hosts issue.
You can also try doing as much as possible offline. DISCONNECT the network from the computer, so that it cannot communicate with the scumware homebase to get stuff while you are trying to remove it.
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