March 2000: PrettyPark Virus Returns: In March the PrettyPark Virus, which originated in June 1999, made a comeback, using Microsoft Outlook to e-mail itself to everyone in the user's address book once every half-hour. But since it was a familiar virus, its effects were easily dealt with.

December 1999: W95.Babylonia Virus: W95.Babylonia came disguised as a Y2K fix, spreading through Microsoft software used for chat rooms. It was able to erase files, grab sensitive information and effectively develop new destructive capabilities as it went along.

December 1999: Fallout From Melissa Virus: In March and April 1999, the "Melissa" virus sent infected mail disguised as an "important message."' Once its attachment was opened in Microsoft Outlook, it copied itself to the addresses in the user's address book. After invading a hard drive, it lowered security settings on Microsoft Word programs, making them vulnerable to other viruses.

November 1999: Bubbleboy Virus: The Bubbleboy virus, named after a character from a "Seinfeld" episode, was the first virus that did not require opening an e-mail attachment to spread. Its effects were minimal, however, since it merely entered the user's hard drive and renamed files after various "Seinfeld" characters and situations.

October 1999: VBS/Freelink Virus Makes A Comeback: VBS/Freelink was a "worm" that not only messed with hard drives, but infested entire networks. Clicking on an e-mail attachment caused the virus to create a shortcut on the user's desktop and copy infected script to the root of the network.

June 1999: Mini-Zip Virus: The Mini-Zip Virus, also known as Worm.Explore.Zip, buried itself in e-mail programs, sending out a copy of itself to the address of any e-mail that subsequently arrived. The virus also moved into the user's hard drive and deleted files created by popular software programs.

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