The CIA (or FBI, or somebody else) isn't really after you
If you have gotten the emails about the CIA (or other government organization) being after you because your ip address has been detected on illegal sites, just delete the email. Don't open the attached file or you will be infected. It is NOT from the CIA (or other government organization). Its just another social-engineering trick to try and get you to install a virus. I believe that this virus is referred to as "Sober X."
Wally