Help with disk repair: "Volume Structure" failed

Hello all:
For the sake of full disclosure let me state right off that I am new to the world of MAC and my not have all the "MAC language" correct - so, if I misspeak (or miss-write) something I apologize.
I have recently purchased an iMac (21.5" - 3.06 GHz Intel Core 2 Duo - 4 GB 1067 MHz RAM - 1 TB harddrive) with OS X 10.6.2 installed. I have to say that after over 20 years with MicroSoft I am enjoying the stability and quality of the MAC.
Anyway, as part of my education in the care and feeding of a MAC I ran the TechTool app yesterday. I had no indication that anything was wrong with the computer - but, I would like to become familiar with the various utilities for the care of the machine "before" a problem occurs.
As the app ran I was pleased to see that all the tests passed (Processor, RAM, Video RAM, etc...). However the computer failed the last test: Volume Structure.
Here are the directions I was given at the end of the test:
Volume Structure
Failed
TechTool Deluxe can scan volumes for problems related to the numerous structures that are necessary for the volumes to operate correctly. If problems are found, TechTool Deluxe can attempt to repair the damage to help reduce the chance of future problems.
If TechTool Deluxe has discovered problems with the structure of a volume, allow the program to repair the problem. Quite often these issues are minor, but sometimes they can be indicative of a more serious problem. If the problem persists, consider backing up the device, reformatting the media, replacing the data, and then testing again.
I was also instructed to access the Apple site and download the most recent version of TechTool Deluxe that can perform repairs.
I downloaded the software and followed the instructions to open the file in the Disk Utility app and burn a CD. Following the directions I then booted up on the CD by restarting the computer while holding the "C" key.
The computer booted up on the CD and loaded TechTool Deluxe. I ran the same tests as above and once again the Volume Structure failed. When I clicked on repair it seemed as though the program was trying to fix the problem - then it abruptly stopped and stated that the Volume Structure could not be repaired.
I removed the TechTool CD, rebooted the computer, installed the TechTool Deluxe that I downloaded from Apple, and ran the Disk Utility. When I tried to "Verify" the disk this is what appeared:
Disk Utility stopped verifying "Macintosh HD"
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.
Following these instructions I rebooted the computer using the Mac OS X installation disk - and the only option I found was for an installation of the OS.
OK.... I give up. Where do I go from here? Is this a serious problem? What the £$%& is going on??!!
Any assistance would be GREATLY appreciated.
Thanks in advance,
Mike

Don't worry - volume structure issues are not serious at all. Follow These Apple Instructions on how to repair your HD using Disk Utility on your installation discs.
You might also consider acquiring a good 3rd party Utility app as there are many things they can do that Apple's DU cannot. DiskWarrior and Drive Genius are my favourites. I use them as part of my routine maintenance schedule. Prevention is better than cure. I believe one should be in every Mac user's arsenal.

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    The reward system helps to increase community participation. When a community member gives you (or another member) a reward for providing helpful advice or a solution to their question, your accumulated points will increase your status level within the community.
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    Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
    Repair
    When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported then click on the Repair Permissions button. When the process is completed, then quit DU and return to the main menu. Select Restart from the Apple menu.
    If  the above doesn't help then you can purchase and try using Disk Warrior to try repairing the drive.
    If the drive is permanently corrupted then you can try reformatting the drive:
    Install or Reinstall Mavericks, Lion/Mountain Lion from Scratch
    Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
    Boot to the Recovery HD:
    Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
    Erase the hard drive:
      1. Select Disk Utility from the main menu and click on the Continue button.
      2. After DU loads select your startup volume (usually Macintosh HD) from the
          left side list. Click on the Erase tab in the DU main window.
      3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
          the Security button and set the Zero Data option to one-pass. Click on
          the Erase button and wait until the process has completed.
      4. Quit DU and return to the main menu.
    Reinstall Lion/Mountain Lion, Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button.
    Note: You will need an active Internet connection. I suggest using Ethernet if possible
                because it is three times faster than wireless.
    if none of the above work then replace the drive.

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