Welcome to the wonderful world of Vista lol. Goto the scanner manufacure web page and see if they have a Vista driver. If they don't you can download and install a program called iCOPY. It is freeware available on downloads.com. you scanner will not have all the bells and whistles but will scan.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix operating systems.