Are you monitoring outbound traffic from your site? Is this report just an avert for some McAfee service?

The OP's frustration is probably because they think the market is not working right. If people knew what the OP does, which is that the seller is taking ~$50 to make the computer perform worse (they could have a much better computer for $50 more), people would make different choices. http://en.wikipedia.org/wiki/Information_asymmetry