When i try to install the mac os x 10.7.3 i start up the computer and apple logo appears and it stucks why? and what should i do?

when i try to install the mac os x 10.7.3 i start up the computer and apple logo appears and it stucks why? and what should i do?

How are you trying to install Lion 10.7.3? Where did you get that version as the current download version is 10.7.4.
Why are you installing 10.7.3? What OS X version was on the computer before you started this install?

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