elfenlied1

Hi, I used to have the same problem. A few days ago some weird noise (like a chime) started to play on my PC. It was seemed to play randomly and for a short moment. At the same time an icon was showing up in the taskbar and was dissapearing right after the sound ended. It was ffdshow audio decoder icon. I disabled the icon through ffdshow settings, even complately uninstalled ffdshow, the strange sound kept on popping. I tried to look at the taskbar when the sound plays, but nothing unfamiliar showed up on the programs list. Even monitoring the running processes with the procmon utility, I couldn't find anything unfamiliar. You know, the sound really made me paranoid :) I wondered if my PC was effected by adware, spyware, trojan or virus. Somehow later I discovered that, the weird chime sound was caused by my digital clock widget at every hour :) I must be getting too old for realising that :) I had installed it with the Yahoo Widgets a few days ago.

A program or something you did installed in recent days should cause those strange sounds, try to remember. And be careful, it can be a spyware too...