I dont have cable tv, but i am prewired for it ( i have those jacks ) i want cable service for the little time i have till college (T3+)... so im signing up for roadrunner. uh.. so i do i need cable tv to get cable modem? hope not... also, if i just get a used cable modem, can they just waive the installation fee? i of course, already have a NIC.. thanks,.