NIS 2011 Ready to install pops up

I am currently using NIS 2009 on a Vista computer and am quite happy with it.

 

Today a pop up appeared saying NIS 2011 has been downloaded and is ready to install. It says it is free

with my subscription.

 

Is it legitimate? I didn't ask for it nor do I want it at this time so how do i stop it from bothering me all the time

(assuming it is legitimate)

 

Thanks