Quote from: mikhan on August 26, 2016, 06:08:12 AM

shift-reboot and choose smth like "don't check drivers signatures" at startup menu

Quote from: Eliovp on August 26, 2016, 06:24:59 AM

Boot windows
Install driver
go to device manager, right click on your gpu, disable it.
reboot to safe mode
replace atikmdag.sys
open the signing tool "http://www.ngohq.com/?page=dseo" and sign that file.
open admin cmd window and type "bcded /set TESTSIGNING on"
reboot
Device manager, enable GPU again.
Done.

Thank you, guys, both ways work.
In my case I even did not need to disable/enable gpu, I just signed that mod driver and it works well after reboot.
It works well on win10 and on win7.