I have played EM4 LA MOD on Windows 7 PC before. I got this new pc and trying to run in but it will not run for more than 5 minutes. What happens is the screen will go black or gray then I can not do anything. I would have to restart the PC by unplugging the cable... And now, when it does run for few minutes it lags so much. My PC is supposed to be high end and runs GTAV very smooth. Below are the specs. GeForce GTX 760 i7-4790 CPU @ 3.60 GHz 16 GB of RAM 1366 X 768 Res Windows 8.1 When the game does run, I minimized it and checked the memory usage and it only used about 525 MB and whole lot of memory was still available but the game still lags. I have tried different resolution but no solution. It still lags for the time it runs and then crashes the whole system. Thank you