Hello DaveJB,
Thank you for posting on the Microsoft Answers Forum.
Have you tried to use the Windows Installer Cleanup Utility. Click here to download the tool.
You can use the utility to remove installation information for programs that were installed by using Windows Installer. Be aware that Windows Installer CleanUp Utility will not remove the actual program from your computer. However, it will remove the installation files so that you can start the installation, upgrade, or uninstall over.
Please reply back and let us know if this utlitiy helped to resolve your issue.
Sincerely,
Marilyn
Microsoft Answers Support Engineer
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