If you did not get a Windows XP CD with your computer, you need to call Dell Tech Support immediately and request one.
The other alternative, which is the one I always use because Windows networking wizard usually tends to mess things up, is to set up the network manually. See the tutorial at www.homenethelp.com
Thanks for your speedy reply. I'm in the UK, and in the box with my new PC was a piece of paper in the shape of a CD saying "your new computer does not require an operating system CD.....". Oh really? Seems I have needed one in the first couple of hours from opening the box......
Anyhow I'll check out the link that you posted. Thanks again.