I haven't had this exact same problem, but I have had problems with Winamp Agent in the past.
Just a suggestion....before you do this back up your registry. Go to regedit and do a find on Winamp. Delete all the references you come across and reboot. I can't say as this will work because I had done a complete reinstall by the time I got a response on my problem. That did work. I never use the agent anymore and the problem has never returned.
You might want to hold out for a while and see if Gary (Yrag) has any input.