Have you been visiting illegal web sites?
Has your Email box recently received notices from the FBI or CIA? Did they detect your IP address(1) as one visiting "illegal web sites"?
Hopefully, you'll immediately realize that these recent Emails are bogus and are attempts at tricking you into clicking on things you shouldn't click. Behind these Emails is the newest variation of something called the Sober worm which will infect your computer and Email itself to other Email addresses it finds on your system.
Rule #101: Don't trust what is says in the "From:" portion of your Email. This can be faked as easily as a return address on an envelope. Don't always trust Email that appears to come from Ebay, PayPal, your financial institution or the FBI.
Rule #102: Don't click on a link in your Email. We all do it, but you should know that any link in your Email can also be faked so even if it says http://www.winpatrol.com, it doesn't necessarily take you to the WinPatrol web site. The underlying code could take you anywhere. Instead, copy the link and paste it into your browser. Even then look at the full URL and only do this if you recognize everything in the address as a properly formatted URL.
(1)IP Address is a number which is unique to your computer that allows it to communicate. A typical IP address will have four sets of numbers like 126.96.36.199