I am no longer using a 360 product, but cannot seem to find the correct folder to remove the plug-in.  Running windows 7 and FM13 Advanced.  Any suggestions?

Google is your friend. http://help.filemaker.com/app/answers/detail/a_id/10097/~/installing-and-updating-plug-ins-in-filemaker-pro shows all the locations where the various FileMakers will store plugins.

I realize this is an older thread but for anyone wondering about this, we have a removal tool that can be found here http://static.360works.com/remove-plugins/. That tool will remove all 360works plugins from the extensions folder and place them in a folder called "Removed Extensions". If you would like to manually uninstall the plugins, locations for the extensions folder for all environments can be found here http://docs.360works.com/index.php/Plugin_installation#Manual_Installation.