Not a silly question at all, are you using an ADSL connection? if so You will need a dedicated phone line to your PC, use an ADSL splitter on
the wall socket then send the ADSL line to your ASDL modem or router, then
send the other line to your 56k dial up modem. Both the ADSL modem and the
56k modem need to be connected to your PC at the same time.