The network driver can be downloaded (you can use the computer you're using now to download to a flash drive) from Dell here
http://www.dell.com/support/drivers/us/en/19/Product/di...
Note that two different drivers are available there depending upon hardware installed, the one on the motherboard should be the Conexant one. I'll suggest downloading both onto the jump drive, if you attempt to install the wrong driver, the computer will simply respond "Hardware not found", then try the other one. Make sure to get the drivers though as there are also diagnostics programs there that won't help just yet.