I have a built in. I have a built in Fax modem on my Sony Vaoi and since my stand alone Fax

Question

I have a built in Fax modem on my Sony Vaoi and since my stand alone Fax machine broke down, I have been using the PC based software that comes with Microsoft . The problem I am having is that most times I have to re-boot my PC before a fax can come through which is really annoying since I have to keep my PC on at all times for some programs that I use. I can send faxes anytime.