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Boot on safe mode and check again
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
Do you have enough internal storage, do you get an error?
yes I have 1 gb internal free and aprrox 3 GB on SD card.
there in no error just that video is does not run normally, it hangs.
please advsie.
what if you try this
settings > apps > all > album/video > clear data
where is the video stored?
videos are stored in SD Card
That's probably the issue, which class is your SD card?
I am not sure ablout the class of SD card but other videos that I store in SD card work fine (downloaded or shared videos by different applciations).
Please advsie.
transfer those videos to a computer and check again