Finding disappeared files and folders after virus infection of pen drive

Some viruses and worms makes the folders disappear and replaces them with applications or shortcuts to applications that are virulent in nature.
The good side of some of the viruses is that they dont delete the actual contents of the infected system.
For example,in pen drives they hide the files and folders.
Normally, these hidden files and folders can be unhidden by utilizing the "Folder Options" menu in the Tools menu of Windows explorer.
But,most viruses delete the "Folder options" menu and "Task Manager" as well.
One solution is to unhide the files and folders from the command prompt.
To do this,
1.Goto Run (Windows+R)
2.Open Command prompt by typing cmd and press "Enter"
3.Navigate to the pendrive by typing its appropriate drive letter(like E: )
4.Type the following command to unhide the files

attrib -s -h *.*

attrib -s -h *
attrib -s -h /d /s

Now your files will be visible.

Make sure to keep the antivirus up-to-date to prevent viruses.