You need to go to the Compaq/HP website support and download the chipset drivers and probably the network adapter driver and maybe a couple of others as well (USB being one). These will not be on that Dell recovery CD. Maybe you got a Drivers CD with the Compaq and you can use that.
Once these have been download and moved over to your Compaq, you install them and then you go through the network setup. You will probably need to copy them to a CD to get them to the Compaq.
To see what you need start/right click on My Computer/properties/hardware/device drivers
All the ones that are flagged will need drivers.
I have a Compaq Presario 8000, and it crashed the other day so I rebooted it with a DELL reinstallation CD. Now I cannot connect to the internet and I need to install a driver or something to get it going but I dont know which one. Can anyone help in anyway???