Hi
The ticks men that you already have a copy of this file
The open folder with an arrow means you are downloading the file
A black and white broken folder looking afair means that you have an incomplete file matching this in your incomplete folder, and if you go to download it from the search window, it should resume from where it left off.
The stars indicate the quality expected of the download (rather than the file) I donot take a lot of noitice of it
See my link below to the user guide which should explain all these things