Installation of Bamboo for Mac OS X v10.5

Hello,
I would be much thankful if you help me in installing the bamboo dock on the latest version of Mac OS X v 10.5 running on my G4 machine. I downloaded the driver software required for this from over the internet which installed without any problem but when I try to install the dock it gives me the “Installation Failed” error.
It suggests me to postflight script for this and I have no idea what should I do?
The Installation failed.
The installation failed. If you have installed Bamboo Dock before please make sure that it is properly removed from your Application folder and from the Trash and try again. If you have multiple Mac OS X volumes on your machine and Bamboo Dock is already installed on volume.

