PC Running slowly after receiver "Unmountable_Boot_Volume" error, W10

Can you post a screenshot from disk manager so we can see the structure

I would except I can't. We tried a reinstall of windows 10, but it gave us this error code, 0x8007048f, repeatedly.

The error shows:

ERROR_DEVICE_NOT_CONNECTED1167 (0x48F)The device is not connected.

My initial thought was something went wrong and the boot was modified. But the error might mean the drive is having a problem or is intermittent.

If you are checking internal connections, make sure and check both ends. The power connector also needs to be checked.

If it gave you a unmountable boot device, the files on the drive may have been corrupted or not readable for some reason.

It was my guess that they were corrupted. Just keep getting a series of errors and now we can't even reinstall windows. This is the second hard drive we've gotten for her PC. Have no idea.

ArazelEternal said:

The 0x8007048f error usually means that a resource that is needed cannot be found. How are you trying to reinstall Windows? Are you using a DVD or a USB device?

With the unmountable boot volume, I would be looking at the SATA cable that is connecting the drive. Make sure connections are correct and tight. Try a different SATA port on the motherboard if you can. Then try a different cable if possible. IF this keeps up, it may be pointing to a motherboard issue, mainly an issue with the SATA controller.

I am using a USB device. We only have one drive plugged in, but it shows 2. One 900 GB drive (her main drive) and on 400 MB drive (which idk what it is). We are going to use a different SATA port right now. I may even get a new sata cable if this doesnt work. It was my idea that it was a bad SATA since this exact thing happened to her original hard drive.

Okay, now it wont even detect her hard drive. At all. SATA cable is in a different port, it is secured as well. I have no idea what to do and very much annoyed. Any help would be appreciated.

ArazelEternal said:

Can you post the specs of her computer, please? This would go a long way to helping us help you.

The 400 MB partition may be a boot partition depending on what kind of boot scheme is set up.

When you made the USB drive to install Windows, how did you go about making it? Did you use Rufus or anything similar?

It was an official USB from Microsoft that came with the code. And the specs are as follows:
CPU: FX 8320E
GPU: GTX 1050
RAM: 8GB DDR3
Motherboard: Gigabyte GA-78LMT-USB3 AM3+ mATX