Cannot change brightness in windows 8.1

Suddenly my brightness controls stopped working suddenly after a reboot, whereby changing the brightnes using the hotkeys or in the setting only moves the brightness indicator but doesn't acctually change the brightness.
Here is what I tried but didn't work:
Adding EnableBrightnessControl in the registery
Disabling adaptive (automatic) brightness
Repairing boot camp drivers through the USB disk I installed them at
Reinstalling windows using the same USB in boot camp
After the troubleshooting I'm guessing that the drivers in the USB disk are corrupted, however I don't know how to reinstall them again without reinstalling windows along-which I don't plan in doing agian.
I'm using Boot Camp 5.1.2

Update: for a moment I was able to change the brightness after launching a full screen app, however after the next reboot i wasn't able to do so and the fix won't work anymore.

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