Macbook Air 10.5 will not start up Folder Icon "?"

I started up my MacBookAir and I got a Folder Icon "?"
I pulled out my DVD drive and booted off the DVD StartUp Disk that came with the computer.
I pulled up the Disk Utilities and performed a Disk Repair
I got a B-Tree Error
and then it said that it could not repair it.
Is there away to repair the Boot Up for the computer?

Thank you, I just forward a email to DiskWarrior to see if I can do a Download to repair the Air, or if I need to have them send me a DVD.
Thank you
robert

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