I have been facing an issue with the Visual Basic component MSCOMCTL.OCX which I was not able to register (Windows 7 - 64bits).
I found multiple answers on the internet as:
While trying to use the classic regsvr32 and modifying my registry I found that Internet Explorer 10 might cause some compatibility issues with this component.
Uninstalling Internet Explorer 10 instantly solved the issue.
So please check the version of your internet explorer if you have this issue :)