That model has onboard NIC interface, not a network card. If you have a network card that plugs into a PCI slot, the driver will not be found at eMachines. However, you can take the numbers off the large chip on the network interface adapter and type it into a Google search where you will then find lots of sources for the drivers that card needs.
Also, you can buy a new recover disc set from eMachines cheap... $23 with shipping... comes with all the drivers.
TangoTrolly's post is accurate, as well.