These symptoms could indicate a problem with the hard drive or severe corruption in the Windows installation. You will need to use another computer to create a bootable USB to be able to diagnose and repair your computer.
Step 1: You can use the SeaTools bootable which is a comprehensive, easy-to-use diagnostic tool that helps you quickly determine what is preventing you from accessing data on your desktop or notebook computer. It includes several tests that will examine the physical media on your Seagate, Maxtor or Samsung disk drive and any non-Seagate disk drive. You can see more information and download the SeaTool bootable at these links.
https://www.seagate.com/manuals/software/seatoo...
https://www.seagate.com/content/dam/seagate/mig...
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
Step 2: If you don't have any problem with the hard drive, you will need to create a bootable USB with the Windows installation to repair the boot files or reinstall Windows.
Option 1: Repair the boot files
1-Create a USB device with an installation image.
You can create using the media creation tool, download it on this link.
https://www.microsoft.com/en-us/software-downlo...
2-Enter on BIOS/UEFI and change to boot from the USB device.
3-On the installation screen click on "Repair your pc" at the left bottom
4-Click on "Troubleshoot" and then the Advanced Options page will appear.
5-Click on "Command Prompt".
6-Run these commands.
chkdsk c: /f /r (and press Enter)
bootrec /fixmbr (and press Enter)
bootrec /fixboot (and press Enter)
bootrec /scanos (and press Enter)
bootrec /rebuildbcd (and press Enter)
sfc /scannow (and press Enter)
7- Reboot your pc
Note for step 6: You need to change to the partition where Windows was installed by default is the D:
1-Type: D: and press enter
2-After that run the command DIR
3-This command will show the Windows folders like Users, Program files ... if these folders are not shown you need to change to another letter E:, F:, G...
4-When you find the partition you can run these commands to repair it.
Option 2: Reinstall Windows. As long as you do not format the C: drive in the Setup, you will not lose your data, but they are moved to another location. After the installation, you can find a folder Windows.old in the root directory of C: drive. All your files are saved there.
Note: This procedure only will keep the personal files, all software and apps need to be reinstalled.
1-Create a USB device with an installation image.
You can create using the media creation tool, download it on this link.
https://www.microsoft.com/en-us/software-downlo...
2-Enter on BIOS/UEFI and change to boot from the USB device.
3-Click "Install Now".
4- Type your product key or skip it. Usually, your computer will be activated automatically when it's connected to a network if your install the same version of Windows 10 as before.
5- Select the installation type "Custom".
6- Select the C: drive and click Next to proceed. Then, wait patiently until the installation is complete 100%.