Software Install across domain

I am attempting to install encryption software across our domain.  What would be the easiest method to get the software installed.  The software is composed of a setup.bat, setup.exe, and a Utility folder with installation files.  The software is required to be on the root folder of the workstation, so I created a logon script that copies the files from a shared network location locally to all workstations.  My next step is to actually install the software globally.  I have considered running another logon script that just initiates the install, but I also dont want the software to run everytime the users logs into the workstation so there has to be some sort of conditional format to prevent the software from installing if it has already been successfully installed?  I considered adding a spot in the script to copy over a dummy install text file that the script will say, ok if the text file is here then dont install, otherwise continue installing?  I also know there are ways I could do this via group policy but still run into the question of how to prevent multiple installs?  Any suggestions?
CMCITDAsked:
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Paul MacDonaldDirector, Information SystemsCommented:
Since you're in a domain, use a GPO to assign the software:
http://support.microsoft.com/kb/816102

You'll need to make an .MSI of your product.  You can do that with this (among other products):
http://dennisbareis.com/makemsi.htm
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Windows Server 2003

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