Hi Ahmad,
Welcome to Microsoft Community and thank you for your interest in Windows 10.
I suggest you to download the Windows 10 ISO and create a Media Creation tool and then perform Automatic Repair.
Refer to the following link:
http://www.microsoft.com/en-us/software-download/windows10
(Refer to the section "Installing Windows 10 using the media creation tool " in the above article for creating the tool).
Once you have the installation media, follow the steps:
- Start your computer from the installation media. Insert the disk or USB stick and restart your computer. If you see a message asking you to “Press any key to boot from DVD,” do
so. If you don’t see the message, you might need to change the boot order in your computer's BIOS settings so that it first starts from the disk or USB. When you see the 'Install Windows' page, tap or click 'Repair your computer' link to start the Windows
Recovery Environment.
- In the Windows Recovery Environment, on the Choose an option screen, click 'Troubleshoot'.
- Click, Advanced Options and then click on 'Automatic Repair'.
- After this complete the repair and see if you are able to boot in to your computer.
Hope this information was helpful and do let us know if you need further assistance. We will be glad to assist.