Looks like you still have a problem with the Nvidia GeForce GTX 750 Ti driver or hardware.
You have the latest driver available: 19/05/2016 ver 368.22.
ffffd000`2417aa30 fffff801`7051933aUnable to load image nvlddmkm.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for nvlddmkm.sys
*** ERROR: Module load completed but symbols could not be loaded for nvlddmkm.sys
All I can suggest is to try some of the older drivers, see if it runs better then. Either that or replace the video card.
Check temps and PSU voltages, see if they are in spec: Open Hardware Monitor
Also stress the GPU, see what that shows: FurMark GPU Stress Test OpenGL Benchmark
You can also test your RAM and hard drive even though there is no indication of a problem there, you never know:
Download Memtest86+ (you want the 2nd one Download - Pre-Compiled Bootable ISO (.zip)). Unzip it then create a CD from the iso file using your CD burning software. There is a good freeware burner called ImgBurn which will do this easily.
DO NOT burn the .iso file directly to CD. It must be used as input to a program that knows what to do with it, like the one I mentioned above.
You can do this on any computer that has a working CD Burner.
You can also use a Flash drive instead of a CD.
Download - Auto-installer for USB Key (Win 9x/2k/xp/7) *NEW!*.
Unzip and run Memtest86+ USB Installer.exe.
It will format the flash drive if you tell it to. I used a small, 16MB flash drive and it had 8.5GB left when done.
Boot the CD or Flash drive and run Memtest86+ for at least 3 complete passes unless it shows errors sooner than that. An overnight run is even better.
Check the hard drive with the manufacturer's diagnostic tools.
7 Free Hard Drive Testing Programs
Hard Drive Diagnostics Tools and Utilities (Storage) - TACKtech Corp.
Bootable Hard Drive Diagnostics