Using nVidia Settings from nVidia Control Panel will not work after every computer restart, and driver clean reinstall might work on some computers.
Solution--Windows Color Calibration:
1. Go to Windows 10 Settings
2. Click Display adapter properties
3. On adapter dialog box go to Color Management tab
4. Click Color Management button
5. On Color Management dialog box go to Advanced tab
6. On Advanced Tab click Calibrate display
7. On Color Calibration utility, click Next to start the color calibration
8. On Adjust gamma section, slide Gamma to fix the dim problem
Tip: Resize window to see desktop wallpaper as you slide the gamma or optionally open a photo file you are familiar with to find the gamma setting you are most comfortable with
9. Click Next
10. Click on the Skip brightness and contrast adjustment button
11. Uncheck the Start ClearType Tuner check-box to maintain the same font setting
12. Click Next, and you've got your Gamma setting back, even after computer restart