Having troubles installing the MSv7 PlugIn on your Windows system?
Make sure you open the "Adobe Extension Manager" * as administrator. Only this way the necessary files can be placed on their appropriate location on your hard drive.
* "Adobe Extension Manager" is a part of the Adobe Eco-System used to install and organize Adobe extensions for all Adobe products. It comes with your Adobe software and is installed by default. Just try searching your computer in order to launch it with administrator rights enabled.