HT3500 why can't any of my apps on MAC Pro print to my HP Officejet 6700?  The Print Test Page works and the HP utilities correctly work.

OS = 10.5.8
My Windows PCs and laptops work just fine

Processor = 2.4GHz Intel  Core 2 Duo
Within seconds of selecting the disk and clicking on the install button the following error message comes up:
The installation failed.
An unknown installation error occurred.
The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.

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