Installation failed; partition unaccessable

Hello,
I'm running a 2010 Macbook Pro, and tried to install Mountain Lion (10.8.4) from Snow Leopard (10.6.8) via the App Store method. I got the "Install Failed, Macinstosh HD is damaged and cannot be repaired" message, and when I tried to restart I instead got a circle slash "no-entry" symbol with the rotating wheel. When I boot up holding Option to view the startup volumes, I get OS X Installer instead of Macintosh HD which usually appears, and my Windows partition. My Windows works perfectly fine, so I figure it's not hard drive failure.
Tried running disk utility via the installation disk but the Macintosh partition is greyed out. Verifying fails and tells me to repair. Repair doesn't work due to "Invalid B-Tree Node Size." Can't mount the drive either.  Tried Disk Warrior, but it would only recognize the Windows partition. Can't reinstall the OS either.
Safe mode won't boot. Running in verbose mode runs in a loop with a "cannot mount root, errno = 19" error.
Tried connecting my Macbook to another via firewire in target disk mode, but again, only the Windows partition would show up.
I know all my files are still there, but it seems like the mounted installer is blocking off access. Is there a way to unmount the installer to access my partition again?  Or at least access and back up my files before reformatting?
Thanks!

Not if you're getting the red text that indicates that the drive cannot be repaired (as you note:
Repair doesn't work due to "Invalid B-Tree Node Size.").
Clinton

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