How to get Windows Media Player to recognize and find my home movies on another program?! PLEASE READ, THANKS!?

For some reason when I go to videos in windows media player it says there are no videos in your library. I have the movies and pics in another program when I go to the picture tab in windows media player the pics are there. how come it won't recognize the movies from the same folder? and I tried to run that "click here to add files to this library now" that is shows but it imports nothing? when I go to file and open I try to find the movies in the folder that they are supposed to be in and they show the pics but not the movies that are supposed to be there, they are on a photography program but when I try to locate them through windows media player it doesn't show them. its almost like it doesn't recognize them??? I want to download my home movies from widows media player because it burns my movies correctly without skipping!!! should I download a codec thing lol not super tech savy here...OH and a message pops up that says "the selected file has an extension (.MOV) that is not recognized by the windows media player." but I hit play anyways but doesn't work. I BURNt THEM WITH MY DADS COMPUTER AND HIS IS WINDOWS 7. mine is windows xp. his windows media player is different, maybe I do need a codec thing??