Today i have installed windows 7 on 64 bits and i just cannot get past this problem with the sound. I have a 5.1 surround audio system and have installed the latest Realtek HD audio driver on my pc to get all the speakers going. After the installation of the driver every sound came with buzzing. The music, the clicking on folders, games, anything, every sound was buzzing, just like the static you get on radio, a blurred sound, if i may call it that way. This was the first thing to install on my PC after the Opera browser. I only have the standard High Definition Audio Driver from the windows, no other audio driver, so i don't think that anything can interfere with the Realtek driver. Can anyone help please? I've seen this problem on the net but there was no exact answer. Why is Realtek software acting this way? I tried reinstalling or tried older versions, nothing helped. Can anyone give any piece of advice?