After the ArcIMS uninstallation is cancelled, returning to and clicking Add/Remove, all the components are grayed out, even though ArcIMS 3.1 is still listed.
Some ArcIMS files were deleted and some remained.
Manually remove ArcIMS from the system and remove ArcIMS from the registry.
<a href='http://support.esri.com/en/knowledgebase/techarticles/detail/18656' target='_blank'>How To: Manually remove ArcIMS from your registry</a>
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