After a week reinstalling GRP, Steam, Video Drivers, etc., found out that EVGA PrecisionX 16 v.5.3.6 is the one to blame for the constant crashing of the game in my PC, in Win 8.1 Pro x64 and now in Win 10 Pro x64. I think the problem starts with the OSD feature that shows some video stats on the screen on top of the game. I uninstalled it and now no more crashes for me. The video card is a GTX 750Ti, Intel i7-3770, RAM 8 GB, SSD 256 Samsung Pro, all drivers up to date.
EVGA PrecisionX 16 v.5.3.5 used to run without problems, but I'm not going to install it again. Hope this info can help others with this kind of problems and for Devs to take a look for future updates and fixes. Good luck.