What folder directory to install virtual synths and plugins

My C drive got wiped out, so I’m having to reinstall everything. I getting mixed results when installing all of my old plugins and virtual synths. Sometimes after install, they are just not recognized by Nuendo’s drop-down list of instruments. Is there a sure-fire place to install these things? Perhaps C:\Program Files\Steinberg or C:\Program Files\Steinberg\Nuendo 7\VSTPlugins

You can go to the plug-in manger window and add a directory where you have installed your software. Select refresh and they should show up in the manager as well as the drop down menus.