I had to install my Canon MP980 software on to my new Windows 7 laptop and even though my domain account is in the Administrators group I was getting this error: “To install the software, you must log on as a member of the Administrators group.” I tried right click “Run as Administrator” and then running from Command Prompt with Administrator privileges, neither worked.
I got it to work by logging into the machine with a local user account that is in the Administrators group.
You first need to create a local user or use an existing user account: http://windowshelp.microsoft.com/Windows/en-US/help/68a1c4fd-b3f6-4cb9-93a1-8a6023836e531033.mspx
And then add that user to the Administrators group: http://windowshelp.microsoft.com/Windows/en-US/help/0faddcfc-e2a9-4297-a429-3f7e83fe6e361033.mspx
Then login as the user you just created and rerun the Canon software.
I think Canon should change the error message to… “To install the software, you must log on with a local account that is in the Administrators group.”