I tried my disc which I got with my computer from Dell and all it let me do was repair start up (boot) files, restore date, load previously made image etc. bot nothing to do a complete repair. I did the start up repair and when I did SFC I got the same message that there were corrupt files that SFC couldn't repair. I am now downloading the OS from the site you suggested and will try that when complete. This brings me back to my original question. Is there a way to identify which files are corrupt?