I can't wait for the day, lawyers can find a way to hold the "criminals" responsible for malicious activities on the net.
It happened to me "again", and I'm finally wising up to it.
I had a Compaq desktop, that's been working fine for years. I mistakenly
installed a MacAfee anti virus program, not knowing the wife already had us set-up with frontier. So she un-installed Mac, a few days later,and there was a conflict between the 2 suppliers, and it/they finally "wiped" out my hard drive. Because my puter was on the older side, I guess I could've used an up-grade anyway, (which I just bought myself for Christmas), but it still burns my hide knowing these anti-virus suppliers can get away with it. It happened to me years ago, but I didn't put it together, until now.
So how do they know, "Warning! your computer's at risk!" anyway?