Lenovo Z400 touch Brightness Problem in Windows 10

I have just upgraded my laptop to Windows 10 and when I booted it up the brightness on my screen was very dim. I tried to adjust the brightess as I normally would (Fn + F11 (or F12)) but it doesn't change the brightness even though it recongnizes me wanted to change it.  I had this problem when upgraded to Windows 8.1, but the fix I had for that doesn't work on Windows 10. Any help?

I have solved it!so first you DOWNLOAD (again) the Intel video driver beased on your bit(32 or 64) HEREhttp://support.lenovo.com/fr/fr/products/laptops-and-netbooks/ideapad-z-series-laptops/ideapad-z400-touch-notebook/downloads/DS037399  then when you run it, it won't because it is not compatible with Windows 10 BUTNAVIGATE to C:\Drivers\Intel Video Driver\9.17.10.3223 RIGHT CLICK ON Setup.exeCLICK on Run as administratorThen SELECT compability AUTOMATED( don't search for it manually)RESTART  SOLVED! THIS IS FOR LENOVO Z400 TOUCH 64-bit. hope it will help others as well

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