In the occasion that you are unable to correct an issue with your Windows installation, and you are unable to utilize a Windows restore point or backup image, you may need to reset your Windows installation.
If Windows will boot, but has issues which would warrant a reset of the operating system, please follow these instructions.
If Windows will not boot, please use instructions found here for installing Windows cleanly from a USB thumb drive.
You may find instructions on how to reset Windows from Microsoft by clicking HERE.