Ethernet Controller - no drivers?

I have a Dell Dimension 4600, which seems to have an Ethernet card. (There is a spot in the back for the larger cords used with DSL & Cable) When I go into the Device Manager, it says no drivers are installed for this device. How do I get the drivers and get it working so I can set up my home network with cable internet? Right now I have it set up to use USB, but that is no good, I need to use the Ethernet. I put in the Dell Rsource CD, and it said something about "Broadcom NetXtreme Gigabit Ethernet". I decompressed the package that was listed and installed it. Nothing changed. I went on Google and found the drivers for the Broadcom, installed them, nothing changed. How do I get this card working so I can set up my network? (I just have one other comp in the room, and it's Ethernet card is working fine.) I have tried everything I can think of, and I don't want to have to call up a local tech and pay $60 an hour if it's something I can do myself.

Any Help is appreciated.