if I use winamp in my computer, avast occupied the pcu at 70-100%
Welcome to the forums, pinco. 
You need to tell a little more about your computer’s set-up … OS, cpu, ram, etc.
Do you have a recently updated WinAmp? Also, what other programs might you have running at the same time when this happens.
AMD athlon™ XP 2100+
Ram 768 MB DDR 400
Ge force TI 4200
Motherboard Asus A7V8X
Win XP Pro
I have this problem only if I run winamp , i’ve tested it more and more…
…Then I’m “costrect” (it’s right ??? ??? ??? ;D )to use …windows media player… :‘( :-X :’( 
>:(
Does it happen when you play audio files (what format - MP3?) locally from your disk, or is it an Internet radio, for example? Any special plugin you use in WinAmp?