@Boge42
Maybe worth using DDU (link) and do a complete clean install of the video driver
See in the bottom of the dxdiag the below bit I have pasted , this is normally listed as a video hardware issue, however it can be driver related.
If you press the windows key and type reliability , select "view reliability history" and you should see this 117 BCCode listed
Problem signature:
P1: 117
P2: ffffa004447b9010
P3: fffff80570f0d87c
P4: 0
P5: 3d4
P6: 10_0_14393
P7: 0_0
P8: 256_1
P9:
P10:
I guess one other thing you can do to test with is borrow your brothers video card and see if still occurs, this is a quick way to narrow down very quickly
although you say his is the same does it have the same error ?