What are you trying to play DVD.CD. on-line video, etc. Standard definition or high definition? 2D or 3D? Where did you get the video? What is the format of the file? Does it always hang in the same place? Could it be copy protected?
What else do you have running on your computer - processes or programs? Open Windows Task Manager and start playing the video. Look at the CPU usage and memory used. Tell us the maximums.
Is it the full version or a trial version?
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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.