eMachines never shipped this desktop with Windows XP x64 hence they have no support/drivers for it in that OS. eMachines only supports this desktop in Windows XP and Windows Vista.
Perhaps you need to determine what nVidia chipset is on-board for the LAN and try checking the nVidia website for driver availability. If you're unable to do so, perhaps this program will help:
To find make and model of pc hardware, EVEREST Home Edition
is a free system diagnostics, system information program that will id most hardware on-board a mb. as well as the actual motherboard. It will, in some cases, actually provide a download link for the driver.
Alternate Everest download link: (offers 2 sites to dl program from)
Run the program and then:
Click on Computer
Click on Summary
Right hand window (hardware) if the text is BLUE
this is a link to the web site for that particular hardware.
If you have additional questions or need further help, please post a "copy and paste" of the COMPUTER SUMMARY report (Leave out the Debug–PCI section) from Everest.