For my installation of Cubase 6 – an upgrade from v5 running on Win 7 x64 – the Cubase default VST2 folder is c://program files/steinberg/cubase 6/vst plugins. This is the folder that the stock Cubase plugins go into, and which Cubase automatically scans.
But when i install new, 3rd party plugins, the default installation folder is c://program files/steinberg/vst plugins – this is where my new plugins will automatically go, if i don’t specifiy another location during installation.
But Cubase won’t scan this folder unless i change some settings – use the plugin information utility to add this as an additional plugin folder, and the plugins will be automatically added next time Cubase is started up (ie. if i don’t do a manual scan in the meantime).
Or – Plan B – i can reinstall my 3rd party plugins and, during the installation process, choose the default Cubase plugin folder as the installation location (ie. c://program files/steinberg/cubase 6/vst plugins). This means the new plugins will be automatically when i start up Cubase.
In truth, you can usually just drag 3rd party plugin DLLs and folders into the new location, but this doesn’t always work, and it’s a good habit to install them properly (this could save some troubleshooting grief down the road).
It’s worth taking the time to learn how to deal with plugins properly, because things can get way more complicated – for instance i have another DAW program that i use next to Cubase, which has its own default plugin locations. Plus i have both x64 and x32 versions of Cubase installed, which means that many plugins have to have bridged versions set up as alternatives to the original DLL.