Sony Vaio PCWA-C300S Operating Instructions Manual page 16

If you are using an external CD-ROM drive, follow the instructions on
the screen and copy the contents of the CD-ROM to your hard disk.
When the copy is complete, click "Main Menu".
The Main Menu of the Easy Installation Wizard appears.
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Click "Install Driver".
The following screen appears.
Insert the Wireless LAN PC Card and follow the instructions on the
screen to install the device driver.
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