The driver for the wired network connection is the Intel Pro/100 VE driver. The wireless driver for your system will depend on which wireless card you have. It might be an Intel Pro/Wireless card, or it could be a Dell Wireless card. Without knowing which card you have installed I can't tell you which is the driver for yours.
The drivers for both are definitely on the Drivers & Utilities CD, although my recommendation would be to get the latest driver(s) from the Dell support website.