Hi,
Please do try these troubleshooting steps that may help in solving the issue.
First you'll need to create a bootable Windows 10 USB or disc:
http://www.tomshardware.com/faq/id-2745957/create-windows-installation-usb-drive-dvd.html
Once done, boot your PC into the USB or disc depending on how you created your bootable Windows 10.
- Once Windows Setup is open select the Language to install and the Time and currency format same goes with the keyboard or input method then click Next.
- Next is to click on Repair your computer then select Troubleshoot.
- Click Advanced options then select Startup Repair then select the operating system.
Hopefully this will help.