Thanks for the clarification.
There was no chance of this working with a Windows 8 DVD.
Try this with Windows 10 installation media.
If that doesn't work either, your best option is to perform a clean installation of Windows 10. Below, I'll share a procedure you can follow to try recovering your files if needed, along with a article that walks you through the clean install process step by step.
Follow the instructions below to be able to transfer the files to an external storage device.
- Start your computer using the installation media;
- Choose the language, select "Next", and press "Shift + F10" to open the Command Prompt;
- In Command Prompt, type the command below and press Enter.
notepad
- Notepad will open. Click on "File" and select "Save As";
- A window will open that allows you to browse the files on your computer. Through this window, you can make a copy of your files.
Note: There will be other partitions that are usually hidden in Windows. The system partition, which is usually (C:), should be (D:), and your files will be in the "Users<username>" folder.
Access the article below, go to the end of the article, and expand "Clean install" under "Steps to reinstall Windows with media" to see the instructions.
In your case, start the computer using the installation media and proceed from step 2.
Feel free to ask back any questions.