I was trying to update for macbook book pro. and i restart then it's loading for 4 hours

i was trying to update for macbook book pro. and i restart then it's loading at the lock screen for 4 hours

About the only thing you can try is using the Online Internet Recovery system to reinstall Lion on your Mac over the top of the current install. that will reset all system files and should not touch your personal files or the apps you have installed.
Or iof you have a recent Time Machine backup use that to restore your Mac to that point in time.

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