Make sure your security software provides anti-virus, anti-phishing, safe browsing, a Host-based Intrusion Preventions System (HIPS), and firewall capabilities.

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For the polio virus, war is the last safe haven.

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The U.S. Department of Homeland Security has information on anti-virus software and tips on how to stay safe online.

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Professor Ronald Levy, head of the cancer divison at Stanford University in the US, said that the bird virus could not replicate in human cells, so was likely to be safe to use in humans.

BBC: 'Supercharged' immune system takes on cancer

As more of them do, Mr Jobs reckons, the converts will tell other Windows users how safe Macs are (compared to Microsoft's buggy, virus-prone software) and how user-friendly (just try networking several Macs together, compared to several Windows machines).

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