Level keeps crashing when o try to open it

I have been working on a Level map for my Honours project at university. The deadlione is closing in and last night and today my level keeps crashing when i try to open it. I tried creating a new project and copying the level over and it seemed to work. When Started painting the landscape again everything still seemed fine. I finished for the night saved everything and the next morning when i opned the project it took me to the default level. When i tryed to open my Landscape map i had been working on it crashes with the fatal error. Unreal engine is exiting due to D3D device being lost. When looking into this myself all i get are results from steam games. I have no idea how to fix this for unreal editor.
Any help would be appreciated.

Hello,

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Thanks