Plz help!i’m neither fluent in english nor expert in computers!! my question concerning set up of a modem ?

i’m new to computer world
i’ve just purchased my computer from about three months
to use the internet we bought a 56 k byte modem (called here a fax modem) (i don’t know if this name is valid for all modems or not)
i faced some problems regarding its set up but at the end it worked and i used it for internet for about 2 months
after that we had a dsl connection
for some problems i had to install a new copy of windows (vista)
i used the dsl for about 20 days now
but when the dsl connection disconnects i want to use the dial up connection.it does not work why?
1)after installing a new copy of windows should i re -set up the fax modem?
2)i tried to do so but i didn’t find any .exe file in the cd which came with the modem,why?
3)by the way , after installing a new copy of operating system (windows) should i reinstall all the drivers of the pc or what?
i need information plz

Tagged with: computer world • dial up connection • dsl connection • exe file • fax modem • information plz • k byte • modems • operating system • system windows • three months

Filed under: How To Installing a fax modem