After a boot i get really high frequency in my headset,i ve changed all kind of audio drivers for my motherboard(DFI infinity ultraIIm2-realtek AC97)OS is Win Vista.What is most strange it all worked just fine for 2-3 weeks and problems started afer installing a modded Vista version(rolling back to previous version did not solve a problem and this headset work on another machine with Vista installed).Usb ports also are not the problem,all other usb devices work well.My old headset(logitech not usb) work fine and my speakers also work so i think integrated sound card is also ok.Please help.