Trouble installing Norton Safety Minder on Mac

I'm having trouble getting NSM installed on a Macbook Pro running OS X 10.6.8.  When I get to the step "Set up your OnlineFamily.Norton account", it simply will not recognize the e-mail address I use for my existing Norton account.  Instead, it keeps taking me to a screen to create a new account.  

 

I have tried multiple times, and carefully checked the spelling on the e-mail address, to no avail  I am able to log in to my existing account w/o a problem on that computer via Safari and Chrome, so it's not an issue of not being connected to the internet.

 

Any advice for how to troubleshoot this?