Nvidia Driver Kernel has crashed and recovered [while playing games]

3 weeks ago I bought myself a new PC , built in not by me , and it includes the NVIDIA GeForce GTX 760 graphic card , and I have installed newest drivers of nvidia [390.77 i think ] and I’m sure it’s the newest one.
So while playing games , if i play in windowed mode with lesser resolution it takes a 15-30min to crash but in full screen it takes 5min to crash.
I’ve tried every steps i could fin either in youtube or some blogs or topics… including adjusting the power settings , nvidia control panel , disabling geforce experience and such , but non of them helped me and its been 3 weeks… I also disabled vsync and disabled desktop composition , still crashing

This forum is for support of the NDIA GPU Cloud. For questions regarding game running on a GeForce GTX 760 graphics card please see NVIDIA support at http://www.nvidia.com/object/support.html .

My bad