Hello,
Read this article on Dell support website which show how to restore your Computer´s Software to the Factory Settings without the CD, choose your OS and follow the Step 3 (Notice : Restoring the original factory image erases ALL existing data. This includes files, folders, programs, drivers, E-mails, photos) :
http://support.dell.com/...
Best regards
"Pour trouver une solution à ses problèmes, il faut s'en donner la peine."