Disc needs repair but can't

Had a couple crashes with imovie. I then decided i should fix permissions and try to see if the disc was working well. I fixed permissions. When verifying I find a couple problems. I booted from install disc to attempt a boot HD repair. I can't. Disc Utility (from install DVD) states HD disc can't be repaired. What? Here are the problems as reported from disc verify. Now what? New HD time? Is it user serviceable on my model? 2006 plasic case.
Verifying volume “Macintosh HD”
Performing live verification.
Checking Journaled HFS Plus volume.
Checking extents overflow file.
Checking catalog file.
Missing thread record (id = 3137939)
Missing thread record (id = 3580841)
Invalid key length
The volume Macintosh HD could not be verified completely.
Error: This disk needs to be repaired. Start up your computer with another disk (such as your Mac OS X installation disc), and then use Disk Utility to repair this disk.
Hardware Overview:
  Model Name:          iMac
  Model Identifier:          iMac4,1
  Processor Name:          Intel Core Duo
  Processor Speed:          2 GHz
  Number Of Processors:          1
  Total Number Of Cores:          2
  L2 Cache:          2 MB
  Memory:          1.5 GB
  Bus Speed:          667 MHz
  Boot ROM Version:          IM41.0055.B08
  SMC Version (system):          1.1f5

If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
If you find the need to recover files prior to reformatting see the following:
Basics of File Recovery
General File Recovery
If you stop using the drive it's possible to recover deleted files that have not been overwritten by using recovery software such as Data Rescue II, File Salvage or TechTool Pro.  Each of the preceding come on bootable CDs to enable usage without risk of writing more data to the hard drive.
The longer the hard drive remains in use and data are written to it, the greater the risk your deleted files will be overwritten.
Also visit The XLab FAQs and read the FAQ on Data Recovery.
The above utilities have downloadable demos that will indicate if any data are recoverable, but you must then purchase the software to recover the data.  There are a couple of free recovery utilities - Disk Drill and TestDisk.  Look for them at MacUpdate and CNet Downloads .

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    Magicpony wrote:
    Hi,
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