I can not boot my MacBook Pro. How do I get and save the data that is not backed up??

I can not boot my MacBook Pro running on Lion 10.7.4. I pressed control, comment P and R keys and O got to the disk utility, then I tried to repair disk and it can not be repaired. I get a message that tells me to back up as much data as possible ?. But if I can not open the computer how can I save my data??
I have a back up until 2 weeks ago on time machine. but the work of the last 2 weeks is extremely important how can I get it??
If I use m time machine backup do I loose the additional data of the last two weeks!,
Please help.. It's a huge amount of work that I have done and can not loose it

If it were me, I'd get a new hard drive or SSD and put it in an external enclosure. Boot into the recovery partition, format the new drive (not the old one) and install the OS to it. Shut down the Mac, open it up, and swap the drives. You may be able to read your data from the old one externally if you're lucky. If you're very lucky you may be able to use Migration Assistant to move all your stuff to the new drive.
Look at ifixit.com for the exact procedure to get to the drive on your model. If it's a unibody it's pretty simple.
http://www.amazon.com/Sabrent-2-5-Inch-Aluminum-Enclosure-EC-TB4P/dp/B005EIGUD4/ ref=sr_1_3?ie=UTF8&qid=1392154588&sr=8-3&keywords=2.5+enclosure

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