I have the same problem. The component contains one DLL and three exe-files. I get no complaint about the executables, just unregistering the DLL fails. This has been working in IS10.5, though. It certainly looks as if IS has deleted the DLL before unregistering. Is that a bug in IS2008?
Meanwhile I got the impression that this problem occurs when the components in question have been registered elsewhere after installation - as it happens on developing systems or if the service guys tampered with the installation to have a second version on the system or similar. Install shield seems to note that the registry entry points at a dll at a different location and refuses to remove it. I'm not so sure whether my guess is correct - if it was the problem would not occur on clean systems with just the one installation and all registered DLLs in their right places.
I would be grateful for confirmation as well as for falsification.
