MacBook Pro 1,2 updated to Sno Leo with DVD. Now, further updates fail to install with "unknown error." Appreciate any tips.

Updated from 10.5.8 to 10.6. Runs great with 10.6, but none of the updater combo packages will run. Rebuilt disk permission, ran Disk Utility from installer and disk check good. Cannot figure out why the updaters won't run. There is no password enabled for the root user -- could that be a problem? Any suggestions appreciated.

Install this first.
http://support.apple.com/kb/DL1512
Then try installing the update to 10.6.8

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