Unlike most viruses, worms do not usually modify or "infect" existing files on a computer. They are usually self-containedfiles, often dropped into system folders such as the Windows folder. Therefore, removing a worm from a computer should simplybe a matter of identifying and deleting the files it installed, and the registry links that may be pointing to them. However,removal may be made more complicated because:
Virus scanners are good at detecting and removing the files belonging to worms, but they often do not repair or remove theregistry changes correctly. Therefore an anti-virus program can sometimes do more harm than the worm, by removing it andleaving the computer unusable, or displaying various error messages when you use it.
Removing Win32 Bagle.HE worm
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