A 35-year-old computer programer pleaded not guilty to charges that he planted a computer virus designed to destroy all the data on 4,000 Fannie Mae computer servers the day he was fired from the company. Rajendrasinh Babubhai Makwana, an Indian citizen who had been working as a contractor employee at Fannie Mae's facility in Urbana, Maryland, was indicted on Tuesday by a federal grand jury for computer intrusion.