How to quickly repair startup problems on Windows 10

To use the Startup Repair feature to troubleshoot boot problems in Windows 10, you must enter the Advanced Startup Settings.

While in the Advanced startup setting, follow these steps to do Startup Repair:

1. Click the Troubleshoot button.

2. Click the Advanced options button.

3. Click the Startup Repair button.

If still have problem let's do with command prompt click right below Startup repair and run the following command one by one 

C:
cd windowssystem32config
md backup
copy *.* backup
cd regback
copy *.* ..
A