Customers cannot use UCITA to sue software vendors for damages, even in cases like the recent attacks by hackers using the Melissa virus and the Worm.

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Subsequent investigation of the virus showed that it was written using a virus toolkit by the name of the Visual Basic Worm Generator that is widely available on the internet.

BBC: Anna Kournikova

Worse, the worm can "lobotomize" anti-virus software, Corman says, so that it appears to be running but has no effect.

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The virus is more properly known as a worm because it needs the help of others to spread itself.

BBC: Anna Kournikova

It could be a virus on a USB stick, as the Stuxnet worm showed, though it went in the other direction.

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Practically every outbreak of a worm or malicious virus has been preceded by warnings from the security community.

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The worm that infected computers at the Marine Corps headquarters at the Pentagon early Friday was ExploreZip, an especially malicious virus that typically travels by e-mail, according to a Marine Corps spokesman.

CNN: ExploreZip stings Marine Corps HQ - October 23, 19999