Hello, thanks for replying.
SeaTools tests passed. (not posting image bcuz it just says it passed, no additional info)
The drive has 31 TBW on the clock, havent remembered correctly. Life is at 78%.
As i previously stated, the drive's file table is prolly corrupted, so nothing can be opened nor read from it - cannot install anything. Only works in Safe Mode for some reason. Diskpart in recovery showed mixed up drive letters, with the C: letter being assigned to a whole different partition on a different drive.
I managed to make the Windows partition mountable on Debian, so one of the options could be backing up the files onto the drive with Linux and reinstalling Windows, but i don't wanna do that straight away.
LMK if i should just backup and wipe the drive or proceed with bothering repairing it.