Yes, I have done a few things already, including memtest. I'll copy from the forum:
The things I have tried:
- Updating my BIOS.
- The ISO I downloaded has been md5 checked, all fine. I have also tried 2 other ISO files from 2 other mirrors - same.
- Three (3) USB drives to install Mint, ranging from 8 GB to 24GB.
- Installing with or without multimedia codecs.
- Turning on secure boot before install (I was desperate, found a forum post with a similar error message, later I found out that it was for a different reason).
- Turning off secure boot before install (I found a different forum post where the exact opposite was recommended - later I found out that it was for a different reason).
- Installing in compatibility mode.
- Offering a sacrifice to Xebeth'Qlu, tormentor of souls.
- Running gparted before install, deleting the previously half-installed partition, formatting it myself to ext4, then running the installer.
- Splitting the aforementioned partition into a 16GB swap partition (I have 16GB RAM) and leaving the rest of it as ext4 (mounted at "/").
- Running chkdsk -f on the SSD containing the MBR+Win10, then rebooting the PC twice, according to one of the error messages in my post below (then trying to install again).