Hi Matthew,
I won't be able to recreate your issue, so I did a little research. It was advised in some support sites to remove all traces of Wacom software, then reinstall the drivers. Although you would need to make sure to check for any pending updates in the Windows Update app.
If the issue persists, I recommend running the Program Install and Uninstall Troubleshooter. This should help sorting any corrupted registry keys that are blocking the installation.
Let me know if you require any further assistance.
All the best!