ENABLE HIDDEN FILES AND FOLDERS:Many viruses disable the SHOW HIDDEN FOLDER's and files OPTION .
The solution Of this problem is:
http://www.4shared.com/file/89940173/12828651/Enable_Options_to_Change_Hidden_Files_and_Folders_Settings.html
1)JUST DOUBLE CLICK THE REGISTRY FILE.
2)IT will ask whether it should add this key to the registry or not.
3)click yes
4)You will now be able to see ur hidden files and folders.
ENJOy!!