The Flash Player can be installed two ways.
1. If your version of the Flash player plugin is either not updating to the latest version or working correctly, there is a tool available from Adobe to uninstall/remove the Flash player plugin here: Download and run the uninstaller
2. Flash can also be uninstalled from your computer by going to Control Panel\Programs\Programs and Features
Once uninstalled/removed you can obtain the most recent version of the Flash player plugin here: Install Flash Player