New
#31
In this post #3 you stated that 58 GB of your drive is missing. in the post #1, in picture it is clearly shown that Windows backup is using that amount of space (in folder $Sysreset). That folder is shown as empty under Treesize, so it's hidden from Explorer file system.
Install Macrium Reflect free, stop using system restore, and gain that space (restore files + backups) and start making proper backups on external drive.
My thoughts only...