DSL internet connection on older PC

Hello,
I am trying to conncect internet on an older Nobollis PC with XP. I tried hooking the ethernet connection directly and th wireless connection as well, but no luck. I also tried installing an older sbcglobal yahoo internet disc... no luck either. I got the computer from a buddy who said I need to replace video driver??? could this have somthing to do with it too??? Please help i really need to get this internet connection working ASAP .. Thank you !!!