I presume you mean the computer has XP Pro on it and not the fax machine...:-)
Why not use a fax to e-mail service similar to that run by Tiscali?
Senders use an 0870 phone number and you receive the faxes (obviously) as an e-mail:
Changed slightly use wise but could still be useful.
There are many others.
Using your computer in this way means you can read the fax, store it if necessary in a Fax folder and also print it off.