Can't turn off internet sharing

My brand new MacBook Pro has been working perfectly--until out of the blue internet sharing turns on everytime I boot up. I have never used internet sharing and certainly don't want to now, because I can't use my wireless network with it on.
My internet connection has been working flawlessly and I made no changes whatsoever (it simply was on once after booting up, and now is on forever), but I CAN'T turn off internet sharing. In my internet sharing preference panel it says that internet sharing is already off, but my airport menu bar says it is on. This is becoming most irritating. Any suggestions?
MacBook Pro   Mac OS X (10.4.8)   2 day old computer

Are you sure this is not just a neighbour's wireless network?

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