Hi Mirle,
What was the exact scan report that was generated after you ran the ‘Error check’?
Did it provide you an option to delete the files that couldn’t be recovered?
It appears that Windows has tried to recover some of the files in the bad sectors. If they are corrupt and beyond repair, then Windows might fail to open the file or delete it. If you are unable to delete these files, then you can copy the other files to a different location, format the external drive completely to remove all corrupt files, and then copy the other files back to the External hard drive. Right click on the External hard drive in File Explorer and select ‘format’ to format the drive.
Hope this helps. Let us know the results.