Disk Utility and Disk Warrior error on internal hard drive....PLEASE HELP!!

After running idefrag on my internal Western Digital 120gig hard drive. The drive did not appear after I rebooted my mac. I opened Disk Utility and the drive is there but grayed out. I used "repair disk" under First Aid and it gave me this error:
Verify and Repair disk “HD 120”
Checking HFS Plus volume.
Invalid B-tree node size
Volume check failed.
Error: The underlying task reported failure on exit
1 HFS volume checked
1 volume could not be repaired because of an error
Then I tried using Disk Warrior 3.0 to rebuild and it gave me this error:
error ""WD 120 GB" cannot be rebuilt. The original directory is too severely damaged. The disk was not modified (2155, 2179)".
I'm not sure if this is the right area to post this, but I need help as most of my important data is on this hard drive. What else can I do?
I am on a g4 quicksilver with 10.4.3 installed.

Sorry to hear about your problem but unless you are working with very large files such as with video editing, etc., using a defrag utility is not required with OS X and no defrag utility should be used on a hard drive without a backup first.
The current Disk Warrior version for Tiger is 3.0.3 and if Disk Warrior cannot repair the drive/directory, it must be in bad shape which was caused by using idefrag.
You can try using a data recovery utility such as Data Rescue (Prosoft Engineering) which includes a free trial version.

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[Resolve startup issues and perform disk maintenance with Disk Utility and fsck|http://docs.info.apple.com/article.html?artnum=106214]
[Using Disk Utility in Mac OS X 10.4.3 or later|http://docs.info.apple.com/article.html?artnum=302672]
[Disk Utility's Repair Disk Permissions|http://docs.info.apple.com/article.html?artnum=25751]
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That or another Mac OS X installation.
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/dev/disk0
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Disk Utility and Disk Warrior error on internal hard drive....PLEASE HELP!!

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