Trouble installing/activating Microsoft Office Professional 2010 after uninstalling Microsoft Office Professional Plus 2010

i Experts,

I am running Windows Server 2012 R2.

I had installed Office 2010 Professional Plus, but the Product Key I had would not work.
So I uninstalled it.
There is no mention of it in Programs and Features.

I purchased a retail copy of Microsoft Office Professional 2010 (not the Plus version)
When I started to run setup.exe (from the Microsoft Office Professional 2010 (not the Plus version) DVD), the dialogs mention the Plus version.

After the setup was complete, I changed the Product Key to the one provided with Microsoft Office Professional 2010 (not the Plus version).
But activation failed, see this screendump:


Where do I go from here?

Regards,
Leigh