Antivirus vendors are warning of a rapidly-spreading worm that is carrying a potentially destructive set of instructions. The Nyxem worm--also nicknamed the Kama Sutra worm--is programmed to <A HREF="http://news.yahoo.com/s/pcworld/20060123/tc_pcworld/124449">overwrite all of the files on computers</A> it infects on February 3, says Mikko Hypponen, chief research officer at F-Secure. F-Secure researchers found the worm truncates files to 20 bytes and causes an error message when one is opened. The worm appears to be programmed to overwrite all files on the third day of every month. So far, there's no indication where Nyxem originated.