TekWar: TekLords (1994) and they're debating whether to turn off the Internet/Matrix (they're never quite sure which, but I'm gonna assume that "Matrix" in the Gibson sense is essentially the Cloud: big centrally hosted virtual systems) because there's a virus.
It's a) kind of funny that there was a time when we really thought we would be able to turn off every computer in the world if something went terribly wrong and b) actually not that funny because now with the Cloud, we literally could.