Anti-virus firm Network Associates has been forced to issue a hot-fix for its McAfee software after it became apparent that some versions were having trouble picking up the Klez virus.

The problem occurs when the Klez worm tries to spread itself via shared files on a network. On some anti-virus software configurations, McAfee does not pick up the worm until it has been executed, meaning it is free to spread as an embedded file within networks.

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