http://news.zdnet.com/2100-1009_22-5587012.html
If it's gotten to the point where the FBI is involved, don't you think they'd come and see you rather than e-mail?? HELLOThe mail is disguised as correspondence warning people that their Internet use has been monitored by the FBI's Internet Fraud Complaint Center and that they have "accessed illegal Web sites." The e-mails then direct recipients to open the virus-laden attachment to answer a series of questions.
"This is the FBI. We're going to stop by and pick up your computer to check some stuff. Please don't delete anything before we get there. Thanks"