WinFax PRO for windows vista

You'll need one of the newest versions, since the old versions won't run on Vista.

Winfax Pro is now owned and distributed by Symantec.

http://www.symantecstore.com/antivirus/winfax-pro-g.htm

WinFax Pro was discontinued several years ago and is no longer for sale. I doubt that any of the versions will work with Vista.

Vista Business and Ultimate have scan and fax software included. http://www.microsoft.com/windows/windows-vista/features/fax-scan.aspx

Here's an alternative: http://www.faxtalk.com/products/ftfcp/index.htm