Very slow internet....

My internet has been incredibly slow recently..and ive tried everything i could think of. I checked with my ISP, they said my modem was fine, so they sent some ppl over to check the cable connecting from the phone line to my house and they replaced it, and said everything should be good now, And its still not... my dl bandwidth on this computer (destop) is like 100 kbps...and i have a cable modem...i cant listen to any music, ( like streamed music) cant go on youtube, and cant watch streamed movies anymore D: Ive ran it in safe mode, and still the same thing, so its NOT a virus problem, (so i believe) I have a router and i have a laptop connected to it, and its download speeds are perfectly fine. Yes ive tried reseting my modem, it didnt work. And im tired of having to call my ISP and get no where with them (roadrunner). My question is, could it be my network card or something? Or my ethernet cable? or even my router??( ive tried plugging my computer into a different router slot and it did nothing) Really need your help guys, Im handicapped on this comp =(

 

So is anyone gonna help? =\

 

first of all is your modem a modem/router combo? i'm assuming yes. Are you dhcp? What brand of modem? You did say you reset the modem? Doyou have separate Router or modem?? I'm trying to picture all the details. If you are not dhcp then what kind of connection do you have i.e. ppp, dialup etc??