My macbookpro running 10.7.2 will not boot.

I was downloading an update and the plug got pulled in the office. When I tried to reboot I only get the apple logo and the wheel. I can command R boot and run utilities and it shows the HD good, but no matter how I reboot I just get the spinning gear wheel. I tried the PRAM, no results.
Any help?

Try reinstalling Mac OS X 10.7 via the Lion recovery, if you don't have a time machine backup then you should try to backup your data first. 

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