Fatwah on Western Digital
What jumps out at me is since when does an internet provider scan your computer for viruses?
Most ISPs where I live give their users free Norton Internet Security or Mcafee-whatever in the New Customer install disc that includes their support software. I think Comcast subscribers just get NIS free regardless. I can very easily see someone being confused about this.
I've also seen Comcast shut off someone's cable modem for being a massive spam relay.