Quickpar will run through all the rar files to check their status. Green means its good and intact. Yellow means its missing parts. Red means a file is mission. When quickpar is done you will have the option to Repair if quickpar has enough blocks to fix the problem. If not, you could ask for a repost or just delete the files. I'll discuss posting to NG later.
If you had success in downloading (no repair needed) or repaired your download you are now ready to extract your movie.
If you have installed WinRar you should be able to right click on the rar file and choose EXTRACT HERE. This will go through each rar file associated with the download and join the movie file.
The movie file will appear in the folder you might have to scroll over to see it at the end of the list of files. If you have other files in this folder you will have to go to the very end to see the file. A simple refresh might fix that.
There you have a movie file ready to watch! You can now delete the RAR and Par files to save space. You already have what's in them so no need to keep them.