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Does Not Install - Says Already Installed When It Isn't

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During installation I'm getting an error saying: -

The customization cannot be installed because another version is currently installed and cannot be upgraded from this location. To install this version of the customization, first use Add or Remove Programs to uninstall this program: Xml Mapping Task Pane. Then install the new customization from the following location:
file://C:/Users//AppData/Local/Temp/WZSe6.TMP/Xml Mapping Task Pane.vsto

Further Error Details: -

Name:
From: file:///C:/Users//AppData/Local/Temp/WZSE6.TMP/Xml Mapping Task Pane.vsto

************** Exception Text **************
Microsoft.VisualStudio.Tools.Applications.Deployment.AddInAlreadyInstalledException: The customization cannot be installed because another version is currently installed and cannot be upgraded from this location. To install this version of the customization, first use Add or Remove Programs to uninstall this program: Xml Mapping Task Pane. Then install the new customization from the following location: file:///C:/Users//AppData/Local/Temp/WZSE6.TMP/Xml Mapping Task Pane.vsto
at Microsoft.VisualStudio.Tools.Applications.Deployment.ClickOnceAddInDeploymentManager.VerifySolutionCodebaseIsUnchanged(Uri uri, String subscriptionId, Boolean previouslyInstalled)

at Microsoft.VisualStudio.Tools.Applications.Deployment.ClickOnceAddInDeploymentManager.InstallAddIn()

The thing is when I go to Add or Remove Programs, Xml Mapping Task Pane is not listed. When I run Word I don't see it either. I'm running Windows 7 64-bit and Word 2010. I'm in a corporate Domain / Active Directory environment, and had previously installed Xml Mapping Task Pane, since then I've re-installed Windows on a separate hard drive. I'm still using the same profile (which may have some roaming components).

Is there a way to force installation?
Or manually remove any remaining parts left over?
How do I troubleshoot this?

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