You may need to format the drive and start over. Be sure you have a dell windows cd. I use Maxblast 5.0, a free download, to prep drives. I got rid of norton on my system, as it slowed it down. I use microsoft security essentials, but I don't know if you can still get it. It was a free download for one day only about a year ago. The Maxblast 4 cd acts as a boot device; other drive manufacturer's have similar software that comes with retail boxed drives.
Thank you. I appreciate it!