Error using Disk Utility

Hello again everybody. I am in the process of trying to repair my start up volume it appears to have an error. In disk utility I tried running "verify disk" however it gives an error that their is a"Invalid Parent CName in Thread Record." It then stops checking the volume. How would I go about fixing this. I am running a Power Mac G4 Dual 1.42Ghz with OS X 10.4.10 The start up disk is on a 20 GB hard Drive and I have a 80GB as the slave. Again any information on how to repair would be great. In fsck I get an error like above but with (4, 2065)at the end.
Matthew Williams

I apologize if I'm intruding: I'm not sure where to post a question.
I have attempted to do a disk repair and permissions repair on my mac G4. When doing the repair, I get a very long list of red "Invalid key length'. Ultimately it will indicate it can not repair. I have used Norton Systemworks; also with some problem. After reading some of the discussions at this forum, I've come to think Norton may have contributed to the problem. I have just ordered Diskwarrior from the Apple Store. I am led to believe this may help my situation. Please advise if this is correct, and/or there are any other remedies I might try. Do I need to completely erase my startup disk, or will Diskwarrior work through that? Does it sound like I have a more serious problem that may not be able to be fixed.
Thank you

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