I login to my yahoo messenger & reinstalled it many times but the problem isn't resolved?

Is it some kind of a virus? I use Norton Antivirus 2005 %26 regularly update it. I have tried avast too but the messenger still isn't working.

I login to my yahoo messenger %26 reinstalled it many times but the problem isn't resolved?antispam

What exactly is the problem you need solved? Knowing what happens after login would be helpful in giving an answer,