XinCube

Different version of windows have different way to setup fax. 

Windows XP Fax setup

http://support.microsoft.com/kb/306550

 

Windows Vista Fax setup

http://windows.microsoft.com/en-US/windows-vista/Set-up-your-computer-to-send-and-receive-faxes

Windows 7 Fax setup

http://windows.microsoft.com/en-US/windows7/Set-up-your-computer-to-send-and-receive-faxes