This is on my girlfriend's laptop, an ASUS F3Ja (edit) running Windows XP.
It has an integrated network adapter that is not being detected. The device manager shows only the 1394 adapter and the wireless adapter.
I downloaded and installed the driver from the ASUS website for the LAN driver, but that didn't solve anything. I can't uninstall the driver as I can't get to it any which way.
It worked recently by just plugging in a normal cat5e cable connected to our router. But doing the same thing now, with the same cable, results with frustration

.
The BIOS (or the setup at the start of boot up, whatever it is) seems to have no options for LAN configuration other than security (all unlocked) and to be able to boot from a LAN connection.
Trying to manually install a certain driver via "add new hardware" results with a network adapter by the name of "Realtek RTL8168/8111 PCI-E Gigabit Ethernet NIC #2" appearing in the device manager.
As this is my first post here, please let me know if I have posted in the wrong section.
Any help would be great, and I will try to answer follow up question as quickly as possible.