NOt really understanding if your problem is the video card, or the Ethernet. Is your ethernet onboard or do you have a network card installed?
You may want to put in the CDs that came with your products, install them on Windows and see how it runs.
But I call you saying you lost your XP CDs, does that mean you are trying to reinstall Windows(?) or you just want to have the CDs just incase? If all else fails and you absolutly need an operating system, you can try Linux. I suggest Fedora Core 4 from Redhat.
I use it and it's a wonderful operating system. It's free, and can do a lot of things Windows can do. Plus you don't have to be a computer geek to use it. Which is nice for those people that don't know a whole lot about computer programming and things liek that. plus, if you ever get into a problem, you can just search the forums here at...
I got all my installation problems fixed from that site. They're very resourceful and willing to help. Plus you have a lot of people here who can help.
But since your problem isn't an operating system problem, but rather a networking problem. What you may want to do is try using a different cable to see if you get any connection ot your modem or router depending on what you're doing. If that checks out to be OK, then what I would do is go into Windows, try to have Windows search for drivers go doing this...
Hold down the Windows Key on your Keyboard, then press the Pause/Break key while holding down the Windows key. Then from there do the following...
Click on the Hardware Tab>Device Manager, then select your Network Adapter, and click on whichever adapter it displays. Then click on the Driver Tab at the top of the window, and select Update Driver and do whatever the instructions tell you to do.
Then get back to us on whatever it did.