In the past few days I observe that my computer is behaving weird. Whenever I navigate in Windows Explorer I seem to find the folder name as junk characters. Also whenever I try to access some files on the HDD it takes long time to open. Once it restarted as well. Yesterday when I was trying to restart a torrent the computer restarted by itself. Now when I check all the torrent files are missing. This is kind of weird. Could there be any problem with Virus or anything. I scanned my PC using Avast but I didnt find anything.