"At this time, however, the only legal way of obtaining a Windows Vista DVD is from from a legal purchase of the operating system."http://pcsupport.about.com/od/windowsvista/f/download-windows-vista.htmhttp://www.amazon.com/Microsoft-Windows-Vista-Ultimate-VERSION/dp/B000HCTYTEhttp://www.rakuten.com/store/vista-showcase/63437.html
Is the old drive still working? Vista may be on a recovery partition on the old drive. I noticed in another post that you are trying to reinstall on a new drive. You can contact Sony or Microsoft to see if a replacement OS disc is available.