<A HREF="http://news.zdnet.com/2100-1009_22-6146321.html?tag=nl.e550">An email worm disguised as a New Year's greeting</A> is making the rounds on the Internet. Worm-laden messages are titled "Happy New Year" and contain an attachment called either postcard.exe or postcard.zip, according to experts at VeriSign's iDefense Labs, which provides information on security flaws and exploits. If the attachment is opened, malicious software is downloaded from the Internet and can infect computers running Windows operating systems.