System worked fine until Minecraft ver.1.12
I have read some of the other post, but none appear to have the exact symptoms I am receiving.

I have attached an image of the results I get when I try to run Minecraft after the 1.12 Update. I went back to the Launcher and attempted to roll-back to 1.11.xx without success. I have removed all traces of Minecraft from this PC, then did a restore...which also removes all applications except default for the PC. I then reinstalled Minecraft and still get the same blank screen. Minecraft has been running on this PC for over two years without issues. Minecraft now refuses to run on my dedicated game computer.

I find this information in nativelog text file:
Set run directory to O:\Program Files (x86)\Minecraft
Native Launcher Version: 1321
Operating System: Windows 10 Enterprise Insider Preview
Application Hash: d026a01a83aeaec4111e8c7430ad89b21f3a30f3
Application Data directory: C:\Users\RL Roper\AppData\Roaming/.minecraft
Executable Path: MinecraftLauncher.exe
App Directory dir: O:\Program Files (x86)\Minecraft
Start dir: C:/Users/RL Roper/AppData/Roaming/.minecraft
Launcher dir: O:/Program Files (x86)/Minecraft/game
TmpDir dir: O:/Program Files (x86)/Minecraft/tmp
(Optional) Java Launcher hash:
Java Version: 1.8.0_25
x64: 1
LauncherConfiguration from: http://launchermeta.mojang.com/mc/launcher.json
Downloaded config
Native launcher is current
Native launcher is current
C:/Users/RL Roper/AppData/Roaming/.minecraft/launcher_profiles.json doesn't exist, new user?
Using new launcher as a launcher.dll is on disk.
Launcher library is up to date with hash ec064f05257ba720c432bce019329ec56417a61f
Check to see if we can run the launcher
Native launcher is current
Starting launcher.dll with O:\Program Files (x86)\Minecraft\runtime\jre-x64\1.8.0_25\bin\javaw.exe
Found SetDllDirectoryW in kernel32.dll!
Added O:\Program Files (x86)\Minecraft\game to DLL search path
Running launcher!