1. Insert the thumb drive to an empty USB slot.
2. Press Windows + R, and type "cmd". Hit Enter.
3. Enter this command(Take note of your drive letter. For example G: drive or F: drive. Replace the 'f' below with your drive letter)
attrib -s -h -r f:/*.* /s /d
4. Press Enter and wait for the command to execute.
5. Open the thumb drive and you should see the files that were hidden by the virus.
That's all. . . . .