Hi, at first, I tried downloading the iso, and took the course of action of telling it to delete every single partition until there was a single unified one, as is advised in the tutorial if you're using UEFI. Everything was fine, until during the installation process, I got an error about how it couldn't copy the files required for the installation (error code 0x80070017). And so, I tried burning another disk with the same thing, but this time downloaded the software that in turn downloads the ISO file for you, as opposed to directly downloading the iso. (All of the iso downloading and downloading of this software has been on a separate computer, obviously.)
I then burnt the iso that the software had given me to a disk, proceeded to attempt to install windows 10, and huzzah! I now have a fresh, brand new system, with unified partitions, no Linux in sight, that acts as though it came with windows 10 clean installed. No problems whatsoever yet, and I'm proud to say that I'm typing this reply from the laptop itself right now.
There are still a few somewhat daunting tasks of customisation, installing software and putting all of my personal data back on, but my laptop is now clean and running well. I haven't been able to say that for a very long time. Thank you so much simrick This is officially solved.
BTW: I looked up that error code and found this:
Interesting....I would also suggest using a different DVD drive, or maybe copying the installation files to a USB stick (4gb or bigger) and performing a USB install.
The error 0x80070017 translates to "CRC Error" which means that the files that are being copied from the disk are not making it to the hard drive with the same structure, meaning that the "original" files on the disk are being modified/changed/corrupted while being copied to the "destination" location on your hard drive during the install.
This usually means either a bad DVD, or a read error on the DVD drive.