D600 ethernet controller driver?

I just purchased a 2nd hand latitude d600. I installed all hardware okay but only one thing remains and its the ethernet controller driver. I have looked in the Dell download site where I got all the other drivers but I don't know what driver to chose for the ethernet controller. Is it the one under the Communication heading? or the Network heading. If its the Network heading, then what would be the appropriate one. If its the Communication, then it must be the truemobile 5100 pc card...right?  I would like to plug directly into the laptop for the internet.

 

Please help!