I have very unstable recollections of what I saw, I was so shaken. I acted like a child,- stupid me! I just looked inside of every directory and saw just regular files from ...system32 directory. Maybe they were from other directories as well, but I was so shocked by the fact that I have only 4k left on my C: disk that I started to delete them immediately. To my amaze they did not want to dissapear.