Isn’t it nice when we all sing vaguely the same tune.

There is a good chance that your home computer has been hijacked by spammers if you have a broadband net link, but are not using a firewall or anti-virus software to protect your PC.

Even if you use anti-virus software but do not keep it up to date, there is every possibility that you are helping to keep spam alive and spreading.

You could also be helping if you are one of those people that open up attachments on e-mail messages that turn out to contain viruses, rather than the pictures you were promised in a subject line.

Spammers are actively seeking out and hijacking home PCs to act as remotely controlled relays, or zombies, that pass on their unwanted messages.

Home PCs hijacked to spread spam - BBC Online News