Not many folk using dial up here. It just makes sense you need to install the drivers for your modem. I found this with google
Error 678 Computer you are dialing in to is not answering. Try again later.
. Cancel the call if not connected within seconds.
Create a new dialing location
. Wrong phone number is being dialed -set Dialing Properties in Control Panel, Modems.
Make sure Connect only at this speed is not checked.
. See if l or area code needs to be dialed for long distance.
Have them dial the number on their handset.
Line problems; hang up and dial again.
Change modem driver
"The great majority of mankind are satisfied with appearances, as though they were realities, and are often more influenced by the things that seem than by those that are." - Niccolo Machiavelli