Can't lower my resolution in some games its always 1920 x 1080

[RalFrost]

So i have problem in some games that i cant lower resolution. The games are RUST and Herose And Generals. The resolution Stays on 1920 x 1080 and i i dont have option to lower it.Before i could lower put not anymore.

 

[Lutfij]

1| Have you made sure your display drivers are up to date?
2| Speaking of drivers, have you made sure your motherboard BIOS and relative chipset drivers are up to date?
3| Is it possible to pass on your full system's specs inclusive of your OS?