You mentioned you were using "freeserve broadband" so this implies you have a NIC and a cable or dsl modem. You DO NOT need anything else. I have DSL and all you have to do is run a Cat5 cable from the back of your computer (NIC) directly to the cable or DSL modem.
NIC = Network Interface Card
Cat5 = thick cable with a big-telephone-jack-style-plug
Hope this helps.
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