HOW TO SET THE FOLDER OPTION

this is how ur system drive(may be c://) will appear i.e. system files will apear blurred.
N.B. Don't delete any system files (NTDETECT.COM, MSDOS.SYS, PAGEFILE.SYS, MSDOS.SYS, NTDLR, IO.SYS, BOOT.INI, AUTOEXEC.BAT). Except these there should not any file in the category system file. if any found it may be a virus, but flash drives does contain any file like this,so delete the file as u see.(don't double click on it anyway).

u shouldn't double click/right click on any drive (local drives also). To open a drive u should go from the address bar or explore mode as shown below.