My computer try's to download something at the starting screen and shuts down

I turn on my MacBook Pro and it goes to the apple logo with no problems, After a few seconds a little download bar shows up and try's to install something. The progress bar gets a tiny bit of the way through and my Mac just shuts down. I've tried it a couple times and I get the same results... Please help!

Reset the PRAM
If the problem persists try reformatting the hard drive, and reinstalling OSX
Here's a link for reformatting and reinstalling: http://www.ehow.com/how_8096165_format-disk-reinstall-os-x.html
If you need disks, call 1-800-MY-APPLE.
Good Luck!

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