MacBook :: Turned Off And Gray Loading Bar Pops Up When Turn On


My Mac all of a sudden turned off and when I turn it on only a grey loading bar pops up and then it's his down. I went to recovery mode and it says Disk Utility has stopped repairing my hard drive. Then it tells me to back up my files and restore. I need to get some of the files I had on my Hard drive but I don't know how to get them.

MacBook (13-inch Late 2009), OS X Mountain Lion (10.8.2)