What is a missing thread record (id = 3339624) and what can I do about it?

I was trying to updat my IMac to snow leopard and got an error during the process. I restarted my computer on the HD that I was trying to update and I get the boot screen and then it turns off. I then got it to boot on the SL disk and it got me to the repair prompt and the DU. When I verify the HD I get missing thread record (id = 3339624) and It grays out the HD. After restarting and getting back to the DU I can see it again and all my files on it. I no longer care about updating I just want to be back to normal. I don't have any time machean backups and I am very worried. It makes it even worse being able to see my files but not be able to get to them.

That error message means that Disk Utility can't reconcile the catalog entry for a file and it's location on the hard drive. That could mean a problem with the file or a problem with the catalog.
Verifying the hard drive doesn't fix anything, it just reports it's status. You need to boot to either your Leopard or Snow Leopard DVD, bring up Disk Utility, and repair the hard drive. If Disk Utility gives a failure on exit message or tells you it can't repair the hard drive, then you'll need to use a program like Disk Warrior or TechTool Pro, with Disk Warrior being the program most people use. That should be able to fix the problem. Disk Warrior is available from http://www.alsoft.com/diskwarrior/
If you started a major operating system upgrade without having a backup, you're setting yourself up for failure should a problem arise, but you probably know that by now.

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