Thanks, my Mexican friend! You translate my words very well. My english is poor. I read much better than i write. But I'll try explane my situation.
Well, my problem still persist in part. I changed the Avast setup for it start after other applications in windows startup. It did Windows Live Messenger works well.
But the Winamp still persist the same problem. Every time than i try connect on-line radios, it stop working and close.
Before install this version of Avast, i used Avast 4.8 free edition for many years with no problems. At that time, i used Kerio Firewall with no problems to.
Actually, i use only Avast Internet Security 5.0.418 complete version, including his firewall. I uninstall Kerio and Avast 4.8 before install the current version of Avast.
My version of Windows is XP SP3 Professional.