Problem installing Internet Security 2012

First, I uninstalled 2011. Then I try installing 2012 and it tells me it's incompatible with my Vista.

 

I try on another Vista (without uninstalling 2011), and it goes through...

 

I kinda remember 2 options before uninstalling: to keep settings, or clear data (something like that)

I rushed to uninstall and checked 'clear' by accident :smileyfrustrated:

 

Is this the problem, and can it be fixed?