Hello Andrew,
My first guess would be that somehow you accidentally moved or renamed one of Hauptwerk's main folders when browsing files/folders.
Assuming you're using Hauptwerk v5+ (since v4 is no longer officially supported), please:
- Use 'Help | Create a diagnostic file' in Hauptwerk, saving the file somewhere easy to find, such as to your desktop.
- Also in Hauptwerk, go to 'File | Uninstall ...'. Move the window (which is titled "Component Installer Actions") to the top of your monitor, and drag its bottom edge downwards to make it as tall as will fit on your monitor (so that as many entries as possible are visible).
- Without clicking on any other windows, hold down the Alt key, whilst pressing the PrintScreen key. That will copy an image of that (foreground) window to the Windows clipboard.
- Just click cancel to close the Component Installer Actions window.
- In your email application, start a new email.
- In the body of the email, press Ctrl+V to paste the screenshot (which should still be on the Windows clipboard) into the email.
- Also attach the diagnostic file that you created above to the email.
- Address the email to support[at]hauptwerk.com, and also in its body text, refer to this forum topic.
That should allow Francois to see relevant system information, such as Hauptwerk's installation folders, and what components (organs, etc.) are currently present in them.