Hello once again. A friend of mine re-installed his Windows 7 64 bit several weeks ago. Now, everytime he plays some music on the WMP or watch videoclip on the popular video websites, or either watching a movie on KMPlayer there are some noises every with interval 3~7s and duration no more than 1s, from what he told me they sound like scratching or something. He doesn't experience any problems while playing games. He is using Windows 7 SP1/64bit, GeForge 9800GT/GTX 4 gigabytes of ram and core2quad intel processor. Funny thing: Couple of days ago he installed VirtualBox to test 1 program compability on XP, when the windows got installed he went to watch a video while drivers are installing and noticed that the problem was gone. Though, if the virtual machine is offline the problem persists, while if its in it's gone. I can't really explain that thing to myself, my brain can't perform such a process. It's like something happening on Jupiter to influence the size of my d... Things done so far: Re-installed the newest drivers several times, tried with couple packets of older drivers, re-installing of old/new video drivers, older versions than DX11, removing all the drivers completely, no change. He recorded 1 minute of the video he was watching with Bandicam, he said he heard the sounds 15~20 times in that 1min of video, I didn't heard anything other than the video sound. *Re-installing/changing the OS is not an option, as he will have a lot of important data loss. *He won't pay 35EU for new sound card just because of some assumptions, while it was perfectly fine 30 minutes before he re-installed, nor I will advise him to do so. Sorry, I guess this is posted in the wrong section, It'd be much appreciated if moved in the right one. Windows 7 support I assume?