Okej i have a wierd problem. I installed the new winamp, than i figured that i hear some noise whenever i play a mp3. This noise isn't very loud but i can hear it when my volume is high or a quiet song is played. Than later i tryed to play my mp3 files with windows media player, where i don't hear that noise in background. Than today i tryed to play a wav file and i hear only noise in wmp and in winamp. So i tryed to disable wave in volume control, cause this is the cause of all that noise. If i disable it i can't hear nothing, not even mp3 files.

I reinstalled my Realtek AC'97 Audio
I also tryed to give my Realtek drivers a max permission in firewall

In device manager i have under Sound, video and game controllers:
Audio Codecs
Legacy Audio drivers
Legacy Video capture drivers
Media Control Devices
Realtek AC'97 Audio
Video Codecs

Of all that i can only uninstall/reinstall Realtek AC'97 Audio, which i tryed.

Can anybody help me ?

Preferences -> Plug-ins -> Output. Try Direct Sound out if you're using WAV or vice versa. You might also look at 'Configure' for the one you choose.