you can use driver genius it finds most of the drivers for you

This may be harder to find...

Try using software like driver magician to scan your hardware to see if it can recognize the driver - if it cannot I believe the PCG-FX340 have similar parts so the drivers for that may work on your system.

Try using the Intel automatically detect drivers and software option on their website it may be able to find something.
See Link:
http://www.intel.com/p/en_US/support/highlights/chpsts/inf/

Also I found this link -
http://implitech.com/manufacturers/sony/vaio-pcg-fx340-pcg-993l/
Lists the drivers for your computer - not sure about the accuracy though.

http://esupport.sony.com/US/perl/model-...7c30d#/howtoTab
You didn't post your OS, sooo.

I wouldn't trust a third party driver search on my PC.

Jeff

That maybe the wrong model number that you are using is why you cant find any information on it.

http://esupport.sony.com/US/perl/support-info.pl?info_id=265