Follow the instructions:1. First of all, scan your pen drive with any good antivirus, such as AVG Antivirus.
2. If no any virus is detected, then open notepad, go to Save As and save the file in the root of the pen drive as autorun.inf and autorun.ini (Suppose your drive is F:, then save the file as F:\autorun.inf and F:\autorun.ini)
3. Now open command prompt and type the following command and press enter key:
attrib -h -r -s /s /d F:\*.*4. When command is successfully executed, exit from command prompt and now open the drive of your pen drive. You will see that your files are now visible.