MacBook Pro won't get past Apple logo during boot

Hey, recently while I was using on my MacBook Pro (note: just simply browsing the internet), the battery ran dry and the computer shut down almost immediately. When I plugged it in and turned on the computer again, the familiar Apple logo appeared and looked as though it would start up normally. However, an unfamiliar grey progress bar appeared and the usual grey gear started spinning. The progress bar looks as though it reaches up 10-15% completed but the computer just shuts down after that every time. I know it has nothing to do with the charge in the battery as I tried doing it plugged in and even waiting overnight for the battery to charge fully with the plug plugged in.
So, I tried using Disk Utility on the Snow Leopard Install disc (my original MacBook Pro install discs had Leopard on it so I just used the Snow Leopard discs instead). After using the "Verify Disk" command on the Macintosh HD volume, it stated that 'Invalid node structure' and then stated that the disk could not be verified and needed repair. I then proceeded with using 'Repair Disk' and it did say 'Volume repair complete' but then stated 'Updating boot support partitions for the volume as required.' This was when an error popped up and said "Error: Disk Utility can't repair this disk" and then told me to back up my files and reformat the disk.
I'm hoping that I don't have to reformat the disk as I haven't backed up in a while. I do have a separate partition on the hard drive that has Windows 7 on it that I can boot to. At least that means my hard drive hasn't completely died on me. However, I'm unsure what to do at this point to fix the computer. I tried to Safe Boot but it didn't change the outcome of start up.
Any ideas as to what I can do? I appreciate any help.

Thanks for the replies! Anyway, I gave DiskWarrior a try and it failed to work. The first time I tried it, I put the disc into the drive of my MacBook Pro and booted it from the disc. After going through the rebuild process it told me that due to a hard drive malfunction it couldn't append any changes to the drive. I then tried putting the disk into my iMac and used my MacBook Pro in Target Disk mode. This wouldn't even attempt to rebuild my drive saying that there was a hardware failure.
So, I booted into Windows 7 and saw that Windows was able to access the drive and read the files perfectly. All the files were in tact. I don't understand why disk warrior had a problem with it. Anyway, what I can do is reinstall Mac OS X Snow Leopard onto the hard drive again after moving the data onto an external hard drive using Windows. The only problem is that I would have to reinstall all of my programs while reimporting all of the settings and data that I can from the external hard drive. What I want to know is can I make an image of my hard drive (with SuperDuper?), and append that back onto my Mac's hard drive? Would that work again after reformatting the disk or would it just give me the same problems as before? Would it be better or easier to just start new and reinstall everything? Thanks!

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