Has My Email Address Been Hijacked?

You don't say what email you use; if it's hotmail, or if you use facebook &c and your contacts are stored on-line. then S**T happens. Your pc security should be adequate, but a scan with Spybot wouldn't hurt. Unfortunately once your contacts and email address are out in the wild there's little you can do, other than to change you email and password, and have your contacts junk anything from your old address