UE4 Hard crashes Alienware 18

After digging through the forums I thought I would post this as some people may have a similar problem.

I recently went from windows 7pro to 8.1pro on my Alienware PC. Currently all versions of UE4 had run smoothly until I have done so, and regrettably I cannot roll back to 7.

4.7.6 hard crashes straight to a power off on the system. I am unsure why as all other graphics apps run fine, including rendering in Maya or other software. This is a bit puzzling.

I hope that anyone else who may of had this problem can post their notes on how they have dealt with this. I also have manually cleaned the computer and unblocked the fans.