sremick
Got lifeboat?
Norton (or anything else) installed on your PC has no role in whether your Wii can connect to your router. That's one of the points of getting a router: to take your PC out of the picture so you're not dependent on it (because we all know how dependable computers are).
If it worked once but then didn't without changing any settings, then you have a reception or interference problem.
If it worked once but then didn't without changing any settings, then you have a reception or interference problem.