Something was not working properly, which made the theme installer believe that my version of Windows 7 was not supporting Aero. After switching to full Aero with a right-click on Personalize and the selection of an Aero theme in the themes manager, I received the same error message again. I remembered that I was running Aero Basic only, and assumed that the theme could only be installed properly if full Aero was enabled. I received an error message that Aero was not enabled the first time I tried to install the custom Mac OS X theme for Windows 7.
