Is your system or mobile is attacked with antivirus ?

you have made a full scan and deleted the virus , but the files that were on the disk does not get appeared and the properties of the disk or system shows some size is occupied by the files. u may think up of getting a restoring software and restore the files but before getting the restoring software just try this :
->open the any disk , pen drive locations
->In the search box ,type *.jpeg or *.jpg or *.mp3 or *.3gp and it can be any format of the file which u think would exist in that drive
case 1:
->If the files that were not displayed before appears in the search , then right click the file and select open location
->select all the files in that location and move them to another location
case 2: go to tools> folder options >view >show hidden files

Hope this may help you to get the files back......