Since you are using ZoneAlarm all you have to do is block any transamission to or from that adress. Next download PestPatrol for a free trial. Use it to scan your hard drive and remove any pests (Trojans, RATS, Spyware, etc). If youre not impressed let it lapse, if you are impressed buy it. Also scan your system using your virus scanning program. That should leave you with a clean system at least for a while. I'll be glad to help if you need any more.

Mayhem