Files that you save on your flash drive can be lost lost from the hardware. Autorun Exterminator software protects your PC against those viruses which use the autorun.inf file in the hardware to infect the system. It monitors all the drives, checking for the file autorun.inf in the root of the drive. If it finds it, it will automatically delete it. If you find your files missing from the flash drive, the reason is all the files from the drive have become system files due to viruses, when you connected to your system. To reinstate your files from the drive you need to have this Autorun Exterminator and make sure that Show Hidden Files and Folders option is enabled.