09-12-2012 04:26 PM
Since that is apparently a South Africa machine, you will find your drivers HERE. This is a site for U.S. machines.
09-13-2012 10:13 AM - edited 09-13-2012 10:25 AM
Adding detail to CB's accurate response..
Satellite L775-14R (PSK3WE-03X017F3)
Get your downloads for part-number family PSK3WE here. I would try the Windows 7 driver.
You might try the following stack, which looks like it's been tweaked for Windows 8, and applies to the US equivalent of your part-number family (PSK3WU).