Please do not post your service tag on this public forum.  It is prohibited by Dell's Terms of Use and will be removed anyway by the Dell moderators when they find this thread. If you ordered your computer with Vista, and did not order the special downgrade option at that time, your computer would have been shipped with only the Vista DVD.  Asking Dell for replacement installation media will only get you another Vista installation DVD. The license with Vista Business does allow you to downgrade to Windows XP Pro, but you will need to obtain the media yourself.  I would try to obtain a Dell labeled copy of the Windows XP Professional installation disk as this would be most easily installed. If you purchase a regular Microsoft copy of the Windows XP installation disk you may need a Certificate of Authenticity with product code as well.  Given the fact that a downgrade to Windows XP Professional is allowed I would try calling Microsoft in this case to see if they will give you an activation code based on your COA for Vista that is glued to your computer case. Whichever version of the disk you get, you need to be certain that the disk includes at least Service Pack 2 in order for the disk to include the basic drivers for your computer.
 I have the dell vista business disk and went through the re-install screens however it re-installed vista business without asking me to downgrade or install xp pro.  Do I need another disk to install xp pro?  I don't see one with my stuff so I was wondering if it was on the same vista business disk somehow.  Thanks for the help.
Reinstall xp pro from vista business disk