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It sounds like what you need is the 10.6.8 combo update V 1.1
You can get it here
After you download and install that update, make sure to restart your mac and then for good measure.. Run this simple repair
Open your finder ( magnifying glass ) type in disk utility, and launch the disk utility application.
On the left side of the disk utility window, click your mac hd, then at the lower right hand side, click repair permissions .
Once it says permissions repair complete.. You should have a solid foundation from which to work from. Should you run into any further issues or need more help, youre welcome to reply!
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