What is F drive? An additional hard drive or a flash drive or what? Looking back through all your scans there were no scans done of "F" drive. When scans are done, especially with MBA-M then ALL drives must be selected when you tell it to do a Full System scan a box opens which allows you to put check marks in the drives you want scanned. You need to scan any drives which allow storage. Obviously you wouldn't scan a CD drive but anythng with storage on it. Know you have downloaded music at some time in the past because some of what was found was found in some Limewire files. You need to update MBA-M again and redo the Full System scan, this time allow it to scan all drives where there is storage.