[karina]

Not sure how you're enlarging your video. Was your original produced in Flash? You might need to go back to the source .fla file & change the size there in order not to lose quality. If you original was in another format (.avi, .mov, etc.) and converted, you might want to take the original output and use a tool like Sorenson Squeeze to publish it to Flash--it gives you a lot of control over size & quality. Other than that, I don't have any suggestions. Good luck.