How can you repair "invalid node structure and invalid b-tree node size"

I have a MacBook Pro 17" and the original install disk is Mac OS 10.4. I have an update 10.6 install CD, but I cannot use it to boot up my computer. My computer had been running on 10.6 when the problem occurred.
It seems my harddrive has crashed. It only boots to apple logo and spins. I have reset the pram. Started up in safe mode with shift pressed down and started up on the start up disk, where I did repair disk and got this "invalid node structure invalid b-tree node size". Then it said repair failed to complete. I tried booting again but it still failed. I thought doing a restore might solve the problem. I have a month old backup with time machine which is on a lacie external drive, but when I try to restore using my original 10.4 install disk, I can only choose the lacie hardrive icon (by dragging) and cannot choose the folder in the backups with the latest backup. When I tried to restore, it says my source is not a valid option. Is this because it is a 10.4 startup disk.
Basically I have two questions: Is there a way to fix my problem without doing a restore and if I have to restore, how do I restore my time machine backup? Will I need to do a reinstall with 10.4 and then update to 10.6?
I really hope to find a way to have my computer back to how it was when it started spinning and if not, at least as it was when I did the latest backup 3 weeks ago.
Please help me!!!
Rebecca

You should be able to boot to the Snow Leopard upgrade disc — you had to do so to install the upgrade in the first place. If you can't boot to it now, either the disc is scratched or dirty or your drive's lens is dirty; for the latter problem, a drive cleaning disc is an inexpensive, frequently-used and often successful remedy, available at any store that sells DVDs.
Because you're running Snow Leopard now, you should repair your hard drive directory using the Snow Leopard version of Disk Utility, not the one on your Tiger installer disc. If you aren't able to do so even after trying to clean your drive, you could buy and use DiskWarrior to rebuiild the damaged HD directory. But DW costs nearly $100, and though it would probably do the trick, that's a bunch of money. You'll have to weigh its cost against the value of the new or changed data on your drive that hasn't been backed up in the last three weeks. If you can get along without that data, then erasing your hard drive and restoring from your last backup is the no-cost, immediate (as opposed to waiting for a DW startup disk to arrive in the mail) solution.

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How can you repair "invalid node structure and invalid b-tree node size"

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