After experiencing this problem for a very long time, I decided to try my hardest to fix it. All of the answers that I looked up did not help at all. If your graphics drivers crash and you are using an NVIDIA card, it's your lucky day!

How to check your video card on Windows 7:

1. Press start and search for 'device manager'. It should be the first option.
2. Click the arrow next to display adapters.
3. If the video card you are using has the term 'NVIDIA' in it, then this solution should work.

Note: this will only fix the problem when you are viewing the video input from OBS, so if OBS is not up and showing a preview, your drivers may still crash.

1. In OBS, click settings.
2. Click on the encoding tab on the left.
3. Select the Nvidia NVENC encoder.
4. Press OK.

The problem should now be fixed, congratulations! :D

omg thank you so much. this was driving me nuts and I couldn't figure out why this game loved to make OBS crash.

Thanks! I've recently been having this issue.