Macbook Pro won't boot mac osx and files are not backed up!

I have a macbook pro 13" (mid-2010) model. I upgraded the HDD from a 500 GB to a 1TB and the RAM from 4GB to 8GB.
From when I upgraded the laptop till about a week ago, it was working fine - I partitioned the 1 TB into 2 parts using bootcamp I installed windows 7 operating system and on the other part I have snow leopard. Since lion osx and mountain lion osx were released i updated my mac os.
Basically the problem is that I was recently watching a movie on my laptop and then all of a sudden it was stuck and I decided to restart my computer by doing a forced shut down and from then on my mac os stopped working - it would always go to the white apple screen and then would not start. I then went into disk utility and it said that the mac hdd partition is damaged and could not be repaired and that I should start backing up as much data as I could.
Since I upgraded the hardware myself - the warranty that covers the computer is basically nulled. Please help I need to back up my files and repair my HDD. I am more concerned with backing up and saving all my data and I am willing to replace and buy a new HDD if necessary!
oh and one more thing the windows part of my HDD is still accesible which means that the HDD itself is not fully damaged.
If anyone can help me - I would appreciate it!

Since I upgraded the hardware myself - the warranty that covers the computer is basically nulled.
Warranty is not made void by upgrading memory or storage. If you have AppleCare then you should be fine.
Disk Utility is powerful, but not the most powerful tool out there. There might be other applications (sometimes expensive) that can fix the volume. If your Windows partition works but not the Mac partiiton that leads me to believe the issue is solvable.
Can you read the Mac files from your Windows partition?

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