Ok lost first let me be clear about one thing, our rules are very specific about giving help regarding anything to do with p2p problems for a number of reasons. We will, however guide your attempts to remove it if should you need it.
That being said, it is very possible that whatever you did do by way of torrents may have introduced malware into your system that has caused your problem
If the methods for finding the "lost" files already suggested fail to locate them I would suggest that you remove all of any p2p programs you may be running and come back to us for disinfection instructions.