The “Kernel Security Check failure” in Windows 8.1 or Windows 10 can appear for different kinds of reasons like memory issues, virus infections of the Windows 8.1 or Windows 10 but the most common is that the drivers you were using for the previous versions of Windows are not compatible with the new Windows.
Seeing that you have a NVIDIA GTX 750, I suspect that is your problem.
Nvidia does not play well with Win 10.
Get the latest drivers from Nvidia, if that doesn't work, reinstall the driver you had before on whatever OS you had.
If that still doesn't fix it, go to Nvidia and start going backwards down the revision list and try each one until you find one that works.
Which ever one you finally find that works, do a clean install of it.