I've been having trouble getting internet access through an ethernet connection since doing a fresh install of windows XP.

It appears that I'm missing the driver for the ethernet controller.

Looking in 'device manager' under the network adapters section there's an apparently working '1394 Net Adaptor' but under unknown devices there's the question-marked ethernet controller, which I believe is what I want the driver for.

I found an old cd that contains the driver for it (Realtek 8139 or some 81xx). There's no setup tool, but only 3 files (a .cat file, .inf file and .sys file).

I've tried right-clicking on the .inf file and using 'install' and also tried just copying the .sys file into the system32/drivers folder but neither have got me anywhere after restarting. The ethernet controller is still listed in 'unknown devices'.

EDIT: I've also tried updating the driver in the device manager, pointing it at the folder containing the driver, but this hasn't worked either.

Any ideas?

Thanks