What's important, few years ago I had exactly the same problem, and it turned out it's some kind of infection. I had to repair all the MP3s with FS-MP3Fix program, and they were fine. So I downloaded this appz again but this time it doesn't work. I tried to scan my comp by Comodo, DrWeb and Spybot, but got no results.
What's even more important, I've just reinstalled my system few days ago(Win7 x64). The system is on the disc C, and infected files are on disc D (which have not been modified in any way). I hope you can help me guys...
I attached OTL log.