I have a long time I use it , but now it doesn't work well . I don't know what to do , what to check. I use ADSL 256KB/sec

I tnink this is probably what you're looking for

enable Yahoo Messenger with Voice - Google Search (http://64.233.169.104/search?hl=en&q=enable+Yahoo+Messenger+with+Voice+&btnG=Google+Search)

I would check out Yahoo for info