I had updated PLAY to the latest version; however, I don't think it's located in my C: drive but rather in the HDD on which the libraries came preloaded - a second hard drive in my computer. I've rerun the PLAY installer, but it doesn't seem to give me a choice as to location. Problem is, I can't find where it actually *is* - a Windows 7 search (and it is very different from the XP engine I knew so well) suggests it resides in My Folders, within a sub-folder My Favorites, but that folder is empty. HOWEVER - A search throughout 'in computer' for "play_VST_x64.dll" (I've only just learned how to do this in Windows 7) yields the result: C:\Program Files\Common Files\East West\VSTplugins. I typed this into the relevant place in the Plugin Manager - and kapow! I was in! There was the familiar PLAY interface, and I was able to play the virtual keyboard successfully (i.e. the correct sounds came out of the speakers etc.). However, it didn't show up on the meters in SONAR; conversely, playing the MIDI keyboard *did* show on the meters, and was able to record MIDI data in the tracks.... but I can't hear anything. So, thanks to you guys, I'm 90% of the way there. Once I grasp the concept of getting MIDI and the VSTs to communicate (and I was able to do this before, in XP days), I'll be there. Once more, thanks all.