"digital signature on the update is missing or invalid" 10.6.8 combo 1.1 from 10.6.3.

Also got posted in '10.3 or earlier' community, where other posts are regarding this issue ... I get "digital signature on the update is missing or invalid" trying to install 10.6.8 combo on MacBook currently using 10.6.3.  Have used Disk Utility, Restart, Shut Down, with no luck.  Used Software Update from 2 different avenues, and also downloaded from apple site.  Also searched support.apple, no luck.  Thoughts?

ok. i've done the moving of those plist files, restarted and tried again. it hasn't worked, but thank you for your suggestion. i got excited for a minute or two.
it now says An unknown installation error occured. The installer encountered an error that caused the installation to fail. contact the software manufacturer for assistance.

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