Cannot find audio drivers for sony pcg 662n

Hi I have a sony vaio laptop model number PCG 662N that has no audio since I upgraded to windows xp. Could anyone please assist me with this. I could not get any help on the sony web site either.

from windows xp: click "start">>click "all programs">>click" windows update"...
windows update services will then try to update all devices in your laptop and will also update windows OS...

or from Control Panel>>Performance and Maintenance>>Administrative Tools>>Computer Management>>device manager, right click your device, then click update...windows update services will try locate any update driver for your device...

or copy and paste: %SystemRoot%\system32\compmgmt.msc /s, then right click device manager, right click your device, then click update...
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all methods require an internet connection...