Apple update causing login loop?

I just reformatted my computer and reinstalled the original operating system and everything works good after I put all of my files back into my computer from my backup. However, every time I try to to an update to either 10.6.6 or 10.6.8 I get stuck in this login loop where it asks me to login to my computer(which I normally don't have to do) and then after maybe ten seconds asks me to login again. I went into the single user mode I think it's called and tried resetting the password and deleting the launch services but it's still doing it. Do you have any idea why?

If you follow the directions here and are sure to enter all of this EXACTLY as it appears here, you may be able to solve this problem. Be very careful to note the spaces or lack of in the commands which you will enter.
You will first need to boot into single user mode, which will bring you to a scary looking text only screen. Don't be frightened.
To do this, startup holding the Cmd-S keys together. At the entry which shows root# enter the following exactly. Write it down now, since you won't be able to copy/paste. Pay attention to case and spaces. Everything is lower case. The only spaces are between /sbin/mount and -uw, between -uw and / and between rm and /var/audit/current
Type in
/sbin/mount -uw /
Hit return and then at the next root# prompt, type in
rm /var/audit/current
And hit return
Note: extremely important: the only space in the above command is between rm and /var. There are no other spaces. If you do not enter this command exactly as written you will erase your entire hard drive. YOU WON'T BE ABLE TO COPY AND PASTE WHEN IN SINGLE USER MODE. WRITE THIS DOWN EXACTLY AS IT APPEARS NOW. A SINGLE TYPO MAY WRECK YOUR DRIVE!!! IF YOU ENTER THE COMMANDS AS WRITTEN, THIS IS COMPLETELY SAFE.
At the next root# prompt type in "reboot" no quotes and hit return. Don't type in anything new until you get the root# prompt after entering each command.
If after entering rm /var/audit/current, you get a message back saying "no such file," then just type in "reboot" at the prompt and hit return.

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