Open Question: sending a fax thru word 2003 running vista?

I have a acer extensa 5420 running vista and i want to send a fax thru word 2003. When i click send to, then click recipient using fax modem then click to step 3 (fax software) the microsoft fax option is gray (not usable) and all i seen in the pull down tap is my printer. I don't want to print, i want to fax. In the device manager under modem is HDAUIDO soft data fax modem with smart chip. I use to fax on my desktop thru word 2003 running xp but the desktop is now fried