There have been many posts on the internet about why Windows10 runs in selective mode and will not run in normal mode. Here is the reason, when loading a driver other than one Windows has determined is the best it changes the Windows configuration mode from normal to selective and will not revert back to normal mode.
The proof: I did a clean install of Windows10 Pro 64-bit. When logging in for the first time the display driver is the Windows default. I loaded the network driver next, checked the Windows configuration and it was normal. Once there was connection to the internet, Windows went out and automatically loaded the best display driver for my display adapter, an nVidia GTx 750. I noticed the driver version was an older version from November 2015. I checked properties and selected update driver, Windows came back stating the best driver was loaded. I then went to nVidia's website and updated the display driver. Bam, as soon as the reboot occurred Windows configuration mode went to Selective Mode and would not go back into Normal Mode. Once this happened I had to reinstall Windows10 again as a clean install.
So, the bottom line is this. Windows wants to run the system drivers it determines to be best for your system. Should you update a system driver that has not be sanctioned by Microsoft, Windows10 will run in Selective Mode. Since I had to reinstall Windows10, I have only been running the system drivers Windows has loaded. I am now going through all the updates, so this may change.
I did not load any of the chipset drivers and only loaded the network adapter driver from the CD that came with my motherboard.
I am still experimenting with loading system drivers and updates. Should anything change I will update the post.