Ethernet?!上唔到網...

you need to reinstall the network drivers.

First you can try your motherboard driver CD. If not working, you can download from Internet.

You can open the case and take out the card. the model and brand are normally on the back of the network card.

After installing Windows, you need to reinstall all drivers in order to make your system functioning. Devices such as network, graphic and sound are the most essential functions of computer.

I believe the driver of the LAN card (or Ethernet card) had been lost.
Please find out the driver of the LAN card and reinstall it again.
The LAN card should come with the software.
If it's a all-in-one main board, it also will has a disk with all drivers. Try to run the disk again.

Victor