The persons who provide you with Yahoo CHat Clients usch as YahElite, YTunnel, Yazak, etc. are hacking into your computers through their yahoo chat client software. YahElite was caught loading trojans in one of their updates. All of these chat client providers are using their chat clients to hack into your computers. You should immediately uninstall those chat clients. and have your pcs and intranets examined for security threats. These hackers are adding code to your firmware in your routers in order to evade detection