Sony VAIO PCWA-C300S Mode D'emploi page 37

If the computer you are using incorporates another Ethernet interface
besides the Wireless LAN PC Card, disable the other interface as follows.
1
On the "Start" menu, click "Control Panel", and double-click
"Network Connections".
The "Network Connections" window appears.
Note
If "Network Connections" is not displayed, click "Switch to Classic View" on the
left of Control Panel.
2
From "LAN or high-speed Internet", select the network
adapter to disable.
3
On the "File" menu, click "Disable".
4
Click to close the "Network Connections" window.
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