need to delete a folder in root directory

I have a folder called " windows " in my root directory, which was placed there by a back up hardrive ( i removed latter on after moving all the files to my main HDD ), I don’t have the option to delete it.

Or should I just leave it?, its only 8Kib

Please post the result of this:

cat /etc/fstab

It’s possible the folder may have a mount setting in fstab.
Let’s check that first.

Remove the folder by becoming su in a terminal
cd to /

rmdir windows

But that assumes there are no other folders inside windows. I suspect there might be one called c