As I mentioned in another thread, I recommended a Vista equipped machine to a friend on the (mistaken) assumption that it would be an up-to-date easy operation. I, unfortunately, failed to notice the lack of modem and thereby lay the problem. Dell, the suppliers, had no internal modems available on their site and, initially, I could find no Vista-compatible external modems. Eventually, I found a downloadable Vista driver set for the Zoom usb device and it worked.
It may be that if you are seduced by pretty front-ends (so-to-speak!!), Vista has something to offer, however its designed-in opacity to user input has lead to a lot of enamel being ground off my teeth and a determination to avoid this particular piece of overblown Redmond nonsense like the plague!!