Try opening Bootcamp Assistant in OSX and removing the partition (restore to single partition) and then re-creating the partition and then put your setup disk in for Vista when it tells you and cick continue and you should be good do go.
Shop for your Apple, Mac, iPhone and other computer products on Amazon.
We are a participant in the Amazon Services LLC Associates Program, an affiliate program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.