Macbook Pro not starting up after 10.9.3 install

Hi everyone. I have a mid-2010 15 inch Macbook Pro. After putting it off for some time, I went to install the 10.9.3 update. However, after installing the update, the computer won't start!
A progress bar appears under the Mac Logo during start-up, but it only gets about 1/5th of the way through, when the bar disappears and then the mac shuts down. I've attempted this at least 5 times and it always does the same thing.
I held option during start-up to boot into the Recovery disk, and tried to repair the partition (I also have a bootcamp partition), but it said it was unable to repair. What's my next step? I have a time camp back-up from 50 days ago, so I could restore from that but it wouldn't be ideal. Is there a way to backup my files in it's current state in anyway?
Any and all help is appreciated. Thanks!

Hey NickinTampa,
Thanks for using Apple Support Communities.
Looks like the computer won't start and you have tried repairing the disk. This article gives several other ways to try and resolve startup disk issues.
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
http://support.apple.com/kb/ts1417
Have a nice day,
Mario

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