Hi Friend,
In this case I would recommend you to please try the following link that will help you install the drivers for the same.
http://esupport.sony.com/US/perl/swu-list.pl?&mdl=VGNSZ691NX&UpdateType=Migration&SelectOS=7
Please install Notebook Control and Utilities and the System components drivers from the list of drivers you will see on above link.
Please make sure to selcet the Operating system first that you are using on the machine.
Please let me know if it was of any help.
Thank you.
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