Sounds a bit weird that your .dmp file is too large. Mine are 256-285 Kb. How big is yours?
Concerning games, overheating is a classic. It can happen with amazing precision at the same point of game --- and bang! That would mean dusting off, and checking fans work. Temps can be checked with many programs, CPU by Core Temp,
http://www.alcpu.com/CoreTemp/, and more general by HWiNFO,
http://www.hwinfo.com/. Do notice that program recommendations are relative.
How is your computer working, in general? You could try some of the basics, download, install and run CCleaner,
Link Removed Run it with default settings, and then run the registry part too.