We've heard the community and are pleased to say that we have been able to remedy the issue (identified in our Known Issues list yesterday) causing some PC versions of Far Cry 4 to go directly to a black screen due to the presence of external USB devices. Some have been able to temporarily fix this problem by disabling USB devices and certain drivers, but we realize this is in no way ideal. For that reason, this Friday, November 21st, we'll be releasing Patch 1.4.0 for PC that should remedy the problem and allow PC players to enjoy the game as normal.
Though Patch 1.4.0 will contain additional fixes on release, we wanted to let users know that the black screen issue has been tackled. An update containing the full list of fixes will be posted to the blog prior to the patch being released on Friday. EDIT: the patch will be released on Friday 21st or in the following days.
Ok, I installed Windows 10 and it's amazing (after installing graphics driver)! 
But I'm a 'Gamer' with a little bit low specs computer, and I was playing Far Cry 4 with Dual-Core Fix on Windows 7. Now I Open Extreme Injector and after running as administrator. I download fix again and nothing again!?
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It's not about that game crash. When I open without fix it's working normally but black screen - I need fix! Hope you will have answer and solution! Again: You did nice work with Windows 10!
6 days ago - Now I Open Extreme Injector and after running as administrator. You don't understand, and it's no surprise. Let me explain, far cry 4 was. Some third party created a software called Extreme Injector V3 wich you install in your base game and you run it before running the game and it makes sure it runs.