Thanks for the reply's but the whole point of my problem is that there is no driver CD and when you look at the system information it lists the Modem as a PCI Simple communications device, there appears to be no manufacturers website, and the only reference on the net are messages similar to this from people with the same problem.
It seems the PCI Simple is just a generic modem name.
Generic/built in modems can be a problem. My son has one and when I 'rebuilt' his PC I could not get the modem working. I fitted the PCI (Proprietary) modem from my own PC, loaded the software and bingo it worked! I tried his again and - no joy. I have now ordered a cheap card (D-Link), less than £20 from Dabs, and expect to have no trouble with that. If I do, you shall hear about it - and so will both Dabs and D-Link!