I'm looking for a way to reset my Dell Latitude E6400 to factory settings, or reinstall windows 7. I have had to do this once with a Boot Manager Error. The problem is, I can't find the disk I used to reset to factory settings/reinstall windows. I'm running windows 7 professional and it won't let me do this any other way. A way to reset/reinstall windows 7 or a disk to purchase would be a great answer!