UE4 Editor Crashes in Beginning of a Project

This is my first question in this platform so sorry if I make any mistake :) I create a C++ project from template for UE4.20 or UE4.18, even if i didn't change anything in project, while playing around in up menus editor crahes... I couldn't understand the error from log file so i need help in this because i can't go on with editor like this....

Thanks in advance for help....

Log file has these at the end. So it can be about problem i don't know....

[2018.08.31-11.41.34:859][279]LogD3D11RHI: Error: Result failed   at
D:\Build\++UE4\Sync\Engine\Source\Runtime\Windows\D3D11RHI\Private\D3D11Query.cpp:146
    with error DXGI_ERROR_DEVICE_REMOVED DXGI_ERROR_DEVICE_HUNG
[2018.08.31-11.41.34:859][279]LogD3D11RHI: [Aftermath]
GDynamicRHI=00000280E3480100, GDX11NVAfterMathEnabled=0,
Result=0xFFFFFFFF, bDeviceActive=0