Background noise-hiss in games when playing with headphones.

Hello. Is the place to be a problem with extraneous noise in games, when playing with headphones ( Razer Kraken) ( though the Razer, too, from her movements that noise and interference are changing the menu in games is, when you load a round do not exist in altabe and the system just completely disappear, as in games not all, if you disable vertical sync. the noise is reduced) Advised me to buy an external soundcard, which I did ( I picked the cheapest for the 350R , said enough 3D C-Media CM108 USB ) this thing to glow, but the sound in the system no! With that, tried all USB inputs front and back, everywhere system she put the wood and 0 effect, reboot did not help. Moreover, I found in the Internet for her driver and they simply do not want to get up, saying insert a USB device. but the system sees it and says is working properly! What to do? Thanks in advance.