Hi,
It is suggested to go to Sony Official website to download the driver.
For your reference, you can refer to the following link:
http://www.sony-asia.com/support/product/VGN-SZ79MN
http://esupport.sony.com/US/perl/swu-download.pl?mdl=VGNCR590&upd_id=3586&os_id=29
Note: Since the website is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
Regards,
Vincent Wang
TechNet Community Support
