[skinytwo]

someone was able to see my web cam without any permission by me....while he was watchin, my screen said noone was watching my cam...but he told me what i was doin....no trojan on my pc.....he said he could see my webcam anytime i was on yahoo...if the cam was workin....anyway if i was broadcasting to others or not....he said he knew my id.....
How can he manage this intrusion?
how can i protect my pc against those intrusions?
windows firewall was workin on, and avg antivirus too...