Batch File for office 2007 Install

I am wanting to create a batch file and place under user login for each OU in gpmc. I have successfully done this by pointing to the network installation location and also created an msp file for customization. However, after the initial install it brings up the office 2007 add/remove dialog box when user logs in after initial login like it is still reading the setup script. I am not sure how to have the script check for the installation and if exists skip otherwise install office 2007. I am not to familiar when it comes to scripting so any help will be appreciated.