If the laptop has a COA sticker for Windows Vista, but Windows XP Professional is the operating system on the computer, it can be assumed that the computer was ordered with Dell's bonus feature.  This feature allowed one to order a Vista computer that was downgraded to Win XP Pro by the manufacturer.  It should have shipped with the disks for both Vista Business and Win XP Pro. The only way you will get Vista Business on this machine is to use a Vista Business installation disk.  The registered owner of the computer can request replacements for these disks from Dell.  If you are not the registered owner you will need to complete a transfer of ownership here:  Register your New Dell Product.  Click on the link for Purchased from a Private Individual.  Once you are accepted as the owner of the machine you can either contact Dell Tech Support and request the disks, or if you live in the U.S., you can use this form:  Dell Replacement Disks.
I Have a DELL LATITUDE D530 ! i got it for free and it was used! on the laptop it had the vista sign and from backwards its written MICROSOFT WINDOWS VISTA BUSINESS! But when i turned it on it was windows xp ! so i assume they downloaded windows xp over the vista????   My question is that how can i restore my windows vista business and remove the windows xp because i prefer windows vista! Please help me!   P.S : when i entered the service tag in dell drivers download site it appeared that my laptop was windows vista! i want vista back and remove xp!
I WANT HELP ON HOW TO RESTORE WINDOWS VISTA AFTER WINDOWS XP INSTALL! PLEASE I 
REALLY NEED HELP!