It''s possible that someone hacked your computer (there are lots of viruses and spyware, but it's a different thing when someone specifically targets your PC) and got hold of your address from one of your website accounts, but it's more likely to be someone who already knew where you lived.
You could try an IP Tracer (you can get a Tracer program for free) but I doubt you'll get any useful info. Best thing you can do is to to inform the post office that you are receiving nuisance/malicious mail and see if they can block it (they may even be able to trace it back to source), and change your email addresses - which may be a slight annoyance but it will solve that problem.
What Firewall program are you using? If you have Windows XP, don't rely on the firewall program that is built into it - it only stops incoming attacks; it will not stop a "trojan" from connecting OUT once it has got into your PC. Use Zone Alarm as your minimum defence - it's free and it's more powerful than Windows Defender.
If you've got Windows Vista, then that's another matter - I don't know much about Vista but I'm sure it has a fairly strong firewall.
Use an AntiSpyware program to search for any nasties - use Spybot Search&Destroy or AdAware SE (both are free).
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