Forgive me if I missed some critical pieces of information. Skimmed through the thread.
If you're still having issues, run these commands in PowerShell (Admin). Just right click the Start button and click that option.
After that finishes, run:
DISM /Online /Cleanup-Image /RestoreHealth
Though honestly, I would recommend backing up your data (Go to C:\Users\Username\ and copy that folder to an external drive/USB or pick/choose things like Documents, Music, Pictures, etc.) to an external and formatting. You really don't need those useless bloatware OEM partitions either.
Grab a 16GB+ USB drive and download the Media Creation Tool. This will let you download and create a bootable Windows 10 1809 USB stick. You can then use that to boot and reformat the drive.
Choose to do a Custom Install. Once you reach this screen:
Highlight every partition and click Delete, (Do not do this if you did not back up your data that exists on other partitions!) until only unallocated space is left. From there you can continue setting up your Windows 10. Windows Update will also get all the drivers necessary for your system, assuming it's not too old.
If you need help or have questions let me know.