HT4463 Mac OS X mountain lion, its get freeze at 52 mb.

i'm trying to download the Mac OS X mountain lion, its get freeze at 52 mb. what should i do to solve that please ??

Assuming it is not a keyboard issue...
Try to safe boot by holding down the "shift" key after you turn the computer and keep it held until you see an apple logo, spinning gear and progress bar.  Using safe boot will take longer than a regular boot.
Then navigate to /Library/Prefrences/ and remove the com.apple.loginwindow.plist and lockfile.  For good measure you can remove the com.apple.loginwindow.plist from the ~/Library/Preferences/ folder as well.  Then restart the computer.  If neither of those work, go back into safe boot and enable automatic logon in the Users & Groups.

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