"Please contact your administrator" - my system IS set as the Admin account

I'm trying to install Adobe Air on my Macbook running Snow Leopard. I have only one account on the machine which obviously is set as the admin account.

However, when I run the installation for the package, I get an error that says: "An error occurred while installing Adobe Air. Installation may not be allowed by your administrator. Please contact your administrator".

What can I do to install this package properly?