Hi, there is actually a 'fix' for this which may work for some.
Since 1709 are basic graphics driver for Nvidia, AMD, Intel, Matrox and IBM devices in the OS integrated. You can try to disable this feature, unistall any driver and their remains via DDU and reinstall them, after you deactivated the unwanted devices and it may work properly.
Furthermore you have to always deactivate your Intel HD Graphics and Amd's/IBM's equivalent via UEFI when you have more than one GPU in your Computer - CPU based graphics will always be set as main and default gpu in the OS.
And probably you cannot use your two GTX 295' anymore, because their driver is too old for the newest Windows version. You may want to get back to 1703 - clean reinstall of Windows.
And you will have more problems with a Mac, especially after a 2 years and more, when their performance will be too less. And you can completely forget gaming on them.