Cannot validate the install file, after purchase

I just recently purchased Norton AntiVirus 2009 online. After I received the email with the download link, I downloaded the setup file; sadly after I ran it an error message popped up. It read :

 

A problem has occured that needs your attention:  The install file cannot be properly validated. Please try again. If you continue to receive this message , you should run Windows Update and try again

 

My windows vista x64 package is fully upgraded as of lastnight, rebooted, etc. I downloaded the minor fix file the tech FAQ recommended and that provided no solution.  Is there any other method I have possibly overlooked?