We'll need much more information.
What what kind of video are you trying to use?
Where did you get it?
Is it standard definition or high definition?
What kind of output have you chosen?
What level of PD 14 do you have (ulltra, etc)
Where did you get it?
Please post the dxdiag evaluation text file (as an attachment) to your reply.
Provide us with more information than you think we need so we don;t get into a long QandA session.
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BoilerPlate: To posters who ask for help -- it is nice to thank the volunteers who try to answer your questions !
Anything I post unless stated with a reference is my personal opinion.