Hi @07 Ghost
Create a Win 10 recovery USB and then use it to try and fix the problem.
A recovery USB can be created from any known working Win 10 PC. All you need is an 8GB USB flashdrive and 40-60 minutes of time.
In the host PC go to ''Control Panel > Recovery > Create a recovery disc'' and follow the prompts.
To get to Control Panel in the host PC, click on the search box, left side of taskbar and type Control Panel and click on the Control Panel app that appears as an option.
When you have the USB, insert it into your PC and turn on the PC
Press F9 when the F9=Boot Menu message appears on the screen, wait for POST to finish and for the list of bootable devices to display. Use the arrow keys to select the USB drive option and press Enter. The computer then starts from the USB drive and not the HDD.
When the WRE menus appear try to repair the startup as before i.e. select ''Troubleshoot > Advanced options> Startup repair'' and follow the prompts. ''Do not'' select ''Reset this PC'' because if you do and you select the wrong option after this, it will reinstall Windows and delete all your data [br]