Moved to networking...
You don't need it unless you plan to go wireless with your internet connection. This is a desktop, correct? There's really no reason to do so unless you don't have any way of connecting the internet to your machine, or you have a network and can't get a wire to the switch/hub/router... All Dell's anymore do have ethernet(wired network cards) installed. At least, I've never seen one today without it...
__________________
Urban De-Development
* Athlon X2 4200 | 2048M RAM | 160G HD | 7600GT
* C2D T5250 | 2048M RAM | 160G HD | Intel x3100
* G4 1.33GHz | 512M RAM | 40G HD | Radeon 9200
|