If you wish to delete all of a certain file within a folder and all subfolders, simply go to Start -> Run -> “cmd.” When the command prompt appears, go to the directory that you wish to delete from and then type in “DEL /F /S [*.type]” For example, if I wanted to delete all MP3 files from my PC, I would type in “CD C:\” and then type in “DEL /F /S *.mp3″. All of the MP3 files on my C: drive would then be deleted. Note that if you do not want to delete files within subfolders, don’t type the “/S.”