try searching at manufacturer site and if you are not able to find it I would suggest try a driver updating application.
I use Advanced Driver Updater to keep all my pc drivers up to date, as with it I have to just scan and can update all my drivers in single click just a best optimizer for driver you can also try it.
The best part is if it installed incorrect driver then I can roll back using their restore facility.
you can download it from www.driveroptimizer.com