Unable to install update 10.6.3

I'm having trouble installing update 10.6.3.  I receive an error message stating "the installer encountered errors before itunes could be configured.  Errors occurred during installation.  Your system has not been modified".   This has happened with previous updates, so it's been going on for a few months.  I get the same error when I install manually. 
Any ideas?

So I have a similar problem - could not update to 10.6.3 itunes - keeps saying corrupt file - so as per b noir downloaded  10.6.3 directfrom apple.com/... and now am wondering if installing that will wipe my existing movies songs and settings held by 10.6.1 ???
What did you end up doing after you downloaded 10.6.3 from apple - did you install it or somehow update to it? Did you have a previous version of itunes that it collected your settings, music and movies from or ???

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