If you want to uninstall an external module in Joomla 2.5 you should navigate to the Joomla 2.5 admin area ->Extensions -> Extension Manager.
Open the Manage tab. Select Module from the Select Type drop-down menu. Search for the chosen module in the filtered results and click on the check box besides it. Find the Uninstall icon in the upper right Joomla 2.5 menu and click on it to completely remove the chosen module.
Note that the Joomla 2.5 core modules can not be uninstalled.
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