I was recovering picture file from and cleaning a notebook hdd of my friend's by connecting it to my desktop via SATA to USB adaptor, and even after formatting it Avira warning message keeps popping up with Boo/Tdss.M infection on the removable drive and master boot sector HD1. Does it mean that not only the notebook hdd but also my desktop is infected now? No matter what, Avira cannot remove it. What shall I do to completely clean the system and hdd? Googling showed some processes, but even they look suspicious, as they require installing never-heard-of antivirus programs.