How to recover the hidden files in my pen drive?

The files in your pen drive could probably be hidden due to malware.

It's easy to recover them. Just download the "AutorunExaminator" file from the following link from ccm.net and extract and run the .exe file by double clicking on it.

http://ccm.net/download/download-11613-autorun-exterminator

Then plug in your pen drive to the computer.

This will remove the autorun.inf files from the pen drive and also from the drives.

Then in the command prompt, type the following command.

attrib  -h  -r  -s  /s  /d  i:\*.* 

PS: But remember to replace "i" in the above command with the letter representing your pen drive. Here it is assumed to be "I".

After that command is executed, open your pen drive folder to find the hidden files visible! Cheers.

Then later you can run a quick scan using your antivirus software on your pen drive to remove any viruses in it.