What will you do if Quick Time asks for a CD to run a normal video file ?

In some cases when you try to open a multimedia file with Quick Time player,it asks you to put a CD into the CD drive to open that file although it is on the hard disk. The quick solution to this problem is to put any CD into the CD Drive, but the real reason for this problem is that you have added a file that was on a CD or DVD  to the favorites menu and for an unknown reason ,the program must check if this file is exist on the CD before opening the file you want open at that moment. So, you should remove the file from the favorites or delete all the favorites by this method: open the folder " Documents and settings " then "All users" then open " Application data " then "Quick Time".
Search for the file " quicktimefavorites.qtr " then delete it. Restart your computer and this problem will completely disappear.