Error when installing Autodesk Inventory 2011

Hello Gurus,
I was installing Autodesk Inventor 2011 on Vista when this error happened, see the error message below.
I clicked the link and tried to follow the stated resolution but still the same error happened after reinstallation.
I may have missed something. Anyone here who can guide me and resolve the problem?
Thanks.

Autodesk Inventor 2011
Setup has detected an existing incompatible installation of the following components. You must uninstall these using the Windows Control Panel before proceeding with this installation. For details, see https://knowledge.autodesk.com/support/product-design-suite/learn-explore/caas/sfdcarticles/sfdcarticles/Autodesk-Material-Library-clean-up-procedure.html
– Autodesk Material Library 2011 [2.0.0.41]
– Autodesk Material Library 2011 Based Image library [2.0.0.41]
– Autodesk Inventor Content Center Libraries 2011(Desktop Content) [15.0.2000.19400]
