I so seldom use FAX these days that my most recent computer hasn't been configured for FAX (XP Pro) until today.
I'll try and remember the order of play. The exact order is already hazy!
A Word document ready and saved but still open.
Offline, closed Internet connection and unplugged the DSL modem.
Plugged the dialup modem into a BT socket. (It was already mounted on the motherboard.)
Start > all programs > Accessories > Communications > Fax and install as prompted.
Control Panel > Add/Remove Programs (on the left column) Add/Remove Windows Components.
Scroll the list and tick the Fax box. You will need your XP install CD to complete this.
Now, back to Word and in the file dropdown choose print, and then choose Fax from the Printer list. The prompts are offered to the point where you can sit back and let it have its way!
There is quite a lot of this in Windows Help, and of course pull the plug on Broadband before you plug in the old dial-up modem to avoid confusing the poor old PC.