Vista was not installed.    The Dell Reinstallation CDs are full copies of the OS. They only install Windows, alone. They don't install hardware drivers or any of the software Dell included.  You may need to update some hardware drivers after loading Vista. According the to MS site, you should find an "upgrade" option when you boot from the Vista DVD and begin the installation on a system running XP Pro.  The instructions in my previous post are for XP to Vista, copied from here. Back up your personal files on external media before you begin the upgrade! Ron
Hi! I've a Vostro 1510 and it comes with a XP Professional reinstallation CD and a Vista business reinstallation DVD. It was pre-installed with the XP. I want to upgrade my laptop to Vista, can I use the above Vista business reinstallation DVD?  I'm concerned as it is not a "normal reinstallation of Vista". It is an upgrade from XP to Vista. My question is: is there an upgrade path for me from XP to Vista? Thanks!  
Upgrade to Vista from XP using a reinstallation CD