Software update says I need to do the lastest update which I have tried to do at least 6 times. It downloads the software, the computer restarts, it starts to finish the download and then says ' there was an error in installing the software" What is up?

Software update says I need to download MacOS 10.6.7. Each time I try, I have tried 6 times, the software downloads, it has me restart the system, it then writes the files to disk and then I get an error measage that "there was error in installing the softare. Anybody have this problem and how do you fix it? I am running 10.6.6

Try this before trying to install the update.
Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. 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 click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
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 still have a problem then I suggest you download the 10.6.7 Combo Updater and install it.

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