It sounds like you want to return the video to the previous settings as you have encountered instability. You aren't able to do that when windows loads because you lose video, yes?
I would reboot your pc, and during post you should enter the key that allows for boot options. This differs for different motherboards, but f8 is a typical option. You will know if you've done this correctly when you see a menu that shows different boot options, such "Last known good configuration" and "safe mode".
Enter safe mode and then try to correct the settings in CCC. If you are able to move the slider back to original settings, then reboot into windows and see if it is fixed.