Beeps:
This is what you are looking for (and chances are it was NOT installed in My Docs, that is usually for settings etc.)
Look for BFD2.dll.
Next, scan is both complicated and simple, here is my Preferences screen for VST scan:
Notice how I have Scan For VST Plug-ins On Startup checked.
Notice how I have multiple locations to scan. That was my choice on how I installed my plugs.
Sometimes you need to do a "one time" Re-Scan Existing Plug-ins. Just remember to turn it off before you exit SONAR or it will start all over again if you have Scan For VST Plug-ins On Startup checked.