I just installed Windows 7 (MSDN) on a HP Z200. When I install McAfee 8.7i, i get in the Action Center a message that I need to turn on McAfee. When I hit "Turn on", i get the following error message:
Please note that this picture has been taken from Google and this is related to another program, not McAfee

So McAfee is installed on 4 other Z200 with the same Windows 7. So I'm kinda clueless now.
Any takers?