Q: Bootcamp: Missing driver updates - where can I get them?!

I finally installed Windows 7 Home Premium today on a 150GB partition of my 1TB iMac (27-inch, late 2012) running El Capitan.

I then updated drivers by downloading files from Apple in OS X, opening them in Windows and installing.

Now, I KNOW there are files missing which I can't seem to find anywhere.

I had the same Windows OS on the same iMac around 12 months ago (before I deleted it) and it worked perfectly, there was screen resolution drivers so the screen didn't look botched, the keyboard screen light functions were working, I could start Windows Updates and most importantly I could run the game I installed Windows to play (SW:TOR for those interested lol) - I can do none of this now!!!

Does anyone have any ideas why?

Thanks