Security experts have blamed the continued prevalance of older viruses such as the Netsky and Mytob worms on people's bad habits.

Attackers are abandoning traditional methods of sending malware via email, as they are too easy for virus scanners to spot. Instead, they are opting to include links in emails that direct recipients to infected web pages.

People clicking on the links in these unsolicited mails run the risk of having their PCs turned into 'bots' - essentially spam-generating computers that can be controlled from afar, without the owner realising what is happening.

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