Flash 5 video problems

Greetings all,
I have a quicktime (.mov) video that i’ve imported into flash. If I click on “control” then “play”, the video shows up fine. If I hit ctrl+Enter or if I export as an .swf, however, the video doesn’t play and is nowhere in sight. If I try to export as a .mov, I get “could not perform the operation because of an unknown error” or words to that effect (I don’t want to export what I have as an .mov, I’m just giving more info). Any suggestions/explanations?
thanks