I have another Fax Software installed. Do I have to disable it in order to use Fax4Word?

Fax4Word uses the fax program that comes with Windows 2000 and Windows XP.

However you do not need to disable the other Fax Software. You can install the default Windows Fax printer and then make sure that Fax4Word knows which Fax printer to use.

To do this:
Open Fax4Word.
Click Tools-Fax4Word-Setup Fax Printer and choose the Windows Fax printer instead of the other printer.