My MAC Book Pro is hanging after installing Lion OS

Hi
i have recently installed OS X Lion from the apple store and after the installation is commpleted my MAC started to hang and give a black screen with no responce what so ever.
the only thing i can do is keep pressing the power button until it gose off and then turn it back on.
i get a msg on the screen after it boots saying the you computer was shultdown becouse of an error and it asks me to report to Apple i have done this twise with no use
please advice this is my first MAC.... so im new in this game
thank you

How much free space do you have on your system drive?
Allan

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