Windows 10: Can't install Windows 10, several errors.

Hi, thanks for explaining what you've tried. Please post a screenshot of your system disk partitions.

Just wondering- you have a SSD, but you're installing to a HDD?

Does your PC have a model number and is it listed as Win 10 approved by Asus?

Does your system disk have any partitions you wish to retain, or would you be happy to format it?

Boot from your install media (do not run setup from your current windows install) Then delete partition 1 and 2, and install too the unallocated space. Windows setup will create the partitions it needs automatically.

Hexagon12 said:

As I said, the drive was formatted in GParted, because I could not delete the Windows 8.1 partition on Windows 10 setup. Everything was grayed out in the hard drive options (like format, delete partition). Now, if I make the whole disk unallocated (after GParted), and I create partitions and install on the C: partition, the same errors appear.

I just wanted to make sure you were booting from your install media is all. If you run setup from your current Windows install, it won't let you delete the partition Windows is currently running from. Those options will be grayed out.
Also, you shouldn't have to create any partitions before hand, Window setup will do it all for you. I do it all the time. I delete everything except my DATA partition and install to the unallocated space. Setup will even create the EFI partition on UEFI systems automatically.
You might want to re download the Windows 10 ISO and redo your install media. Just incase you have a corrupted image. How did you create your install media?

Hexagon12 said:

I created (and downloaded) the ISO with the Media Creation Tool. The image is not corrupted, because I have a test rig and with the flash drive/DVD it succesfully installed Windows 10 without any errors.

And about running setup on Windows, no, I never actually booted Windows on that computer, I am fixing this computer for a friend, and he says that there was Windows 8.1 64-bit on this system and that I can wipe the hard drive, there is no important data to recover. I am just making two partitions, because the drive is big and can be divided into a system partition and a data partition.

Ok, that info helps things a lot. It wasn't clear exactly what you were doing from the original post. Not to me anyway.
Since you have already partitioned the drive, try what I posted above. Delete all but that last Data partition and try installing to the unallocated space. I have no idea why the option to delete the partitions was greyed out originally? I wiped the Windows 8 factory install, even the hidden factory recovery partition just by booting from my Windows install media.

I wonder if the hard drive has issues? Was there an issue or problem with the Windows 8 install before you got it?

No, the only problem was getting rid of that Windows 8.1 system partition. I also remember about how this hard drive was in another system and how it BSOD the Windows often with ntfs.sys being the culprit. I actually ran Seagate SeaTools on the drive when the errors (on the Windows 10 install) appeared and the Short and Long DST's passed.

EDIT: Updated specs to the computer I'm fixing.

Hexagon12 said:

No, the only problem was getting rid of that Windows 8.1 system partition. I also remember about how this hard drive was in another system and how it BSOD the Windows often with ntfs.sys being the culprit. I actually ran Seagate SeaTools on the drive when the errors appeared and the Short and Long DST's passed.

Somethings going on? What your having to go through is not normal.