There is some sort of virus in my pc that has deleted all of my audio and video files in all my drives except for the one in which windows is installed (which is the 'C' Drive) All the other partitions in my hard disk with audio and video files got deleted. Even the files in my other 160gb hard disk which had a single partition. When i download any such file onto a partition other than 'C' then after restart they get deleted again. Nothing else seems to have been deleted. I can't access the task manager or the search function. I ran a scan using avg and also ran an online scan through symantec, but didn't find anything except for cookies. My CPU is also running at about 50% even when it is idle. What should i do?