Security specialist McAfee said Monday that it will start <A HREF="http://news.zdnet.com/2100-1009_22-5575678.html?tag=zdnn.alert">updating its virus-matching database every day,</A> and that it will launch a customizable Web site that offers incident and threat information. Starting Feb. 24, the company will move from weekly updates of its virus definition data files, or DATs, to daily updates, said Vincent Gullotto, vice president of the antivirus emergency response team for the company. DATS make up the dictionary of viruses that McAfee's software recognizes.