A worm that recently hit the Internet is another reminder that the new generation of viruses and worms at hand is building in complexity and potential for damage. Frethem.E is the latest variant on a worm designed to take advantage of a security vulnerability in Microsoft Corp.`s Internet Explorer. The worm, which only attacks Windows systems, is roaming around the Internet but few companies have been hit, say security experts, who have given the worm various grades of potential threat. Full Story