Hard Drive errors after update attempt

I have a Macbook with Mac OSX 10.5.7. 2.2 GHz Intel core duo 2GB 667MHz DDR2 SDRAM Western Digital 320GB Hard drive
I attempted updating to the newest version and the computer froze part way through. When I tried to restart I got the daisy wheel running on the grey screen, but would not go further. So i put in the Install Disc, and hit power button and shift key. I got as far as Installer, but when I got the window that asked where to install the OS, there were no choices in the window.
I then removed the disc and tried to boot up, which it did. All the data is there, but I did lose my desktop customization. All applications launch OK (I have tried about a third) except Safari. Safari will not launch.
Based on another post in the forum, i went to Disk Utility and tried to Repair the disk. It failed due to a "Invalid Node Structure". So I tried to Repair Disk Permissions (also based on a forum post). That ran OK, but now the Repair Disk button is grayed out. And when I try to Verify Disk, I get the following:
SMART Status is verified, Partition Map Scheme is GUID.
In the History Window:
Performing Live Verification
Checking Journaled HFS Plus volume
Checking Extents Overflow file
Checking Catalog file
(the next three lines are in red letters)
Invalid Node Structure
The volume MacHD needs to be repaired
Error: Filesystem verify or repair failed
I have also found that there is no longer an administrator for the computer. It is actually my daughter's, and both she and I have (used to have) administrator privileges. Now in Accounts we are both listed as Standard users. I tried to update software. When asked to give my password, it said I was not an administrator (Using the correct password). Neither would my daughter's password work. The laptop does not think we are administrators.
So now the computer is running, and all data is still on it. But I cannot launch Safari. And I cannot update software (as there is no administrator).
(I have seen some posts suggesting third party software which may fix my disk. But they cost $100 and I can buy a new hard drive for 60 to 80.)
Has anyone a clue as to what went wrong? More important- does anyone know how to fix it??
Many thanks in advance.
Mark

After I erase the hard drive (I assume one pass of writing zeros is good enough, 7 passes not needed?) do I turn off the laptop, then turn on and insert the Install Disk? Will there be a prompt telling me when to put in the disk? Or do I put in the disc right after erasing?
One pass is fine. If you've previously backed up your hard drive to an external hard drive using SuperDuper!, which is what I use and recommend, or another program, if it created a bootable drive, you want to boot off of it, bring up SuperDuper! and copy the drive back to the internal hard drive. SuperDuper also makes the drive bootable. When done, reboot, and you should be all set. If you're using Time Machine, you'll want to install the operating system, then restore the Time Machine backup. SuperDuper! is available from http://www.shirt-pocket.com/superduper/superduperdescription.html
Finally- should I update the OS? Is there a problem with the newest update that caused this crash, or was it just a spurious glitch/bad luck?
I've been running 10.5.8 for awhile with no issues, and would recommend moving to it.

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    Hardware Information: ℹ️
        MacBook Pro (Retina, 13-inch, Late 2012) (Technical Specifications)
        MacBook Pro - model: MacBookPro10,2
        1 2.5 GHz Intel Core i5 CPU: 2-core
        8 GB RAM Not upgradeable
            BANK 0/DIMM0
                4 GB DDR3 1600 MHz ok
            BANK 1/DIMM0
                4 GB DDR3 1600 MHz ok
        Bluetooth: Good - Handoff/Airdrop2 supported
        Wireless:  en0: 802.11 a/b/g/n
        Battery Health: Normal - Cycle count 427
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            Color LCD spdisplays_2560x1600Retina
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        OS X 10.10.1 (14B25) - Time since boot: 0:34:43
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        APPLE SSD SM256E disk0 : (251 GB)
            EFI (disk0s1) <not mounted> : 210 MB
            Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
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        Feb 9, 2015, 06:34:50 PM    /Library/Logs/DiagnosticReports/CleanApp Daemon_2015-02-09-183450_[redacted].crash
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