Windows 10: Computer black screen after Windows Defender cleanup

Laptop owner said he ran Windows Defender and it cleaned up something (I don't know what). Now it boots to a black screen.

I looked at Disk Management and it's not right:





I don't see any marked as System. How do I fix this?

:)

 

New Laptop, Black Screen on Start-up

It could be that a third-party antivirus application is causing this black screen after signing in to Windows. Some third-party antivirus software have been known to cause black screens. May we know if there are third-party antivirus applications installed
on your computer? If there are, try to update the application. After updating it, restart your computer and see if it still exhibits a black screen after signing in. If the black screen still shows up after updating your antivirus application, attempt to remove
the application. Removing it won't leave your PC unprotected, because Windows Defender will start if no other antivirus software is running.

We look forward to an update from you.

 

Windows 10 wont start, after successful install?

So it started
here

I disabled Windows Defender and was able to completely install Windows 10 and my computer was working normally for a night, Windows 10 actually looked promising...

BUT in the morning I woke up to a black screen. Restarted a few times, and it is still a black screen after boot. Tried loading Windows Boot Manager, black screen. Not sure what to do.

Please help,

Thanks Dylan.

 

Boot to Macrium recovery and select other tasks / repair (or rebuild) boot.
You can make Macrium recovery USB on other computer or use Kyhi's rescue disk.

Check for malware too.

 

I tried Macrium before I posted this, it didn't help. I should have mentioned that, sorry.

I did fix this by using KYHI's Rescue WinPE disc then running the bootrec commands from a command prompt.

bootrec /rebuildbcd
bootrec /fixboot
bootrec /fixmbr

I think the first one did the trick but it now boots okay so I'm happy.

 

*Thumbs did you check what went wrong? What's in Windows defender logs..

 

I don't have the laptop any more, gave it back after cleaning up a few things.