There is a boot repair program here:
http

/sourceforge.net/p/boot-repair-cd/home/Home/
What you will need to do.
1. Download the program
2. Burn it to a usb with a program like rufus:
http
/google.com/q?=rufus
3. Insert the usb into your computer
4. Press f1 f11 f12, etc other f keys to access the menu to change the boot order from your hdd to usb
5. Press boot from usb
6. Follow the on-screen instructions. Choose the default/recommended settings.