The update "Mac OS X Update" can't be installed

So for the past week I've been unable to update my Mac to 10.5.6 version.  I guess I should look at the bright side that it doesn't tell me to contact my System administrator (ME) to fix it and I wouldn't have a clue.

http://www.pcmag.com/article2/0,2817,2337151,00.asp

PCMag and the Apple discussion boards are a bit messy and looks like maybe this is one update to be glad that it's not working

Apple - Support - Discussions - Installation and Setup:
http://discussions.apple.com/forum.jspa?forumID=1219&start=45

However based on this looks like a reinstall of the OS is in my future.  Ugh.

Apple - Support - Discussions - 10.5.6 unknown installer error ...:
http://discussions.apple.com/thread.jspa?messageID=8644170&#8644170

Read the complete post at http://msmvps.com/blogs/bradley/archive/2008/12/28/the-update-quot-mac-os-x-update-quot-can-t-be-installed.aspx

Published Sun, Dec 28 2008 2:05 by THE OFFICIAL BLOG OF THE SBS "DIVA"
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