I think he's looking to do an "ghosted" restore. In Dell's case (unless you're on an older Dell) there is no longer an image restore. There's a small separate partition on the hard drive that has the diagnostics programs on it, but that's it.
If you want to restore to like-new, you have to format/re-install. You *could* uninstalling everything you don't want, then restoring back to the earliest date in time and then defragging, but a format/re-install is probably what you're looking to do.
It's better than image anyway. You could also get rid of the small diagnostic partition while you're at it, so you gain a few more MB of space and have only one partition on your hard drive, if you please. Hope that helps.