UE4.15.2 Locking Up Computer at character editor

Ive been reading through the project logs they are normal right till the last few lines which all look like this [2017.05.20-16.42.46:536][926]LogD3D11RHI: Timed out while waiting for GPU to catch up. (0.5 s)

all of them end like this, as the computer locks up and is unresponsive.

I made a project called Find_Crash and then did some basic actions like moving around , dropping items into the viewport, looked as skeletal assets etc,. letting it lockup over and over ,. then I looked through the logs (Attached).

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this is only two examples all of them end the same way

Ive also attached the DxDiag file in case this helps. but seems to be normal no problems.

Thks Again. if anyone can shed light on this.