Sometime When your windows get attacked from virus then you can get problem from your copied file but there is no file showing on your pendrive let's solve this type problem.
At first open windows statr button now open
notepad Programme/Accessories/Notepad
1. copy these code from bellow:-
attrib -h -r -s /s /d J:\*.*
J:
del *.Ink /f/s/q
del *.exe /f/q
del Autorun.inf /f/q
C:
tree
cls
exit
2. Now change J: and type your pendrive Letter showing on your computer if there is L just type it L: ok.
3. Now go to File/save as (all files type not as text files) Unhide.bat to your desktop or anywhere.
4. Double click to this Unhide.bat file this will open and close automatic.
5. Now open your pendrive folder look there is showing your hidden files, this bat file removed autorun.inf file and save you.
6. You have done it.