I can't open .pkg files.  i get an error telling me to choose an application to open them.  the Installer app is not in my Utilities folder or in System/Library/CoreServices.

i can't open .pkg files.  i get an error telling me to choose an application to open them.  the Installer app is not in my Utilities folder or in System/Library/CoreServices.

Install the UnArchiver and try again.
http://wakaba.c3.cx/s/apps/unarchiver
There is no Installer.app in the Utilities or Applications folder, there is one in the System/Library/CoreServices.
If yours is not there, then you need to:
1: Backup your data off the machine to a non-TimeMachine drive and disconnect all drives.
2: If you have TM, try to restore the Installer.app from the TM drive and reboot. See if things work.
If the above doesn't work, your going to have to re-install just OS X 10.6 (and bundled programs) from the disk by holding c and booting off the 10.6 disk and simply installing OS X. Then software updating to 10.6.8.
This will replace all bundled programs and OS X, not touch your files (backup regardless) and most third party programs.
Some third party programs will have to be reinstalled form original sources because they install Kext files into OS X and thus kicked out by the 10.6 reinstall form disk.
All should go well, however if you boot to a gray screen or other freeze, reboot holding the shift key down, then update all your third party software to be current to 10.6.8.
Another method is to re-install in to CoreServices the Installer.app from the 10.6 disk using the extraction program called Pacifist from CharleSoft, then running software update to get any updates for Installer.app.
http://www.charlessoft.com/

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