But a lot of them don't even know their computers are infected.

But the computer could be infected only if the recipient opened the attachment to the message.

The owner then assumes that the computer is somehow infected.

We're out of ideas for how to get people to care that their computers are infected with Conficker.

The 3wPlayer employs a form of social engineering to infect computers.

A user's computer could be infected by just opening or previewing a message.

You probably don't know this, but your computer is infected with malware.

I surveyed the network, and found that two thousand computers were infected within fifteen hours.

It was estimated 15 million computers were infected with Conficker.

I did not even know how a computer got infected in the first place or how likely mine was to catch a virus.