Firstly you should not have a Windows Vista sticker supplied with a system that came with Windows Vista Business with downgrade rights to Windows XP Professional. The sticker and the COA should both be for Vista Business Edition. The Reinstallation DVD should be Windows Vista Business Edition. I recommend installing the latest BIOS of the Vostro 1510: [URL] See instructions here regarding updating the BIOS: [URL] Next for the Dell OEM Reinstallation DVD usually an in place upgrade will result in issues with product activation. You should clean install Windows Vista Business via the Dell BIOS and then install the Service Packs and standalone updates and then drivers for more details see: [URL]
I have a vostro 1510 that has a 'vista basic' sticker but came from Dell downgraded  to xp.  About a month ago, I used the Vista Bsns dvd  supplied by Dell with my purchase to upgrade from xp to vista.  Now I am getting a message that my product key is invalid.   The key sticker on the laptop is worn, and I had to guess at some of the letters/numbers, which could be my problem.  Is the key on the sticker good for both xp and vista?  If so, I can keep guessing until I get it right.   Or should I be hunting through my paperwork for a different product key for vista that Dell would have supplied with the vista dvd?   
vista key for vostro 1510 factory downgraded to xp