You might try this.http://support.dell....&c=us&cs=&s=gen
Some computer manufacturers such as Dell, eMachines, and Gateway have begun selling computers without an operating system CD. These computers instead have an option to restore to their original system state. For example, Dell users with this option can reformat using the method above.
Make certain that you back up all files that you wish to keep (papers, pictures, etc.) because they will be lost when you reformat. These are typically stored in the My Documents folder, although may reside in other locations depending on where you save files.
The problem with using a non-dell CD is that you may not have dell specific drivers that they include on a CD(restore CD) if you get one with the computer. If you do try using a non-dell CD you must use a program that will show you your Key that is registered to you. I don't know if using the same key again will work.http://www.magicalje...keyfinder.shtml