NIS install and upgrade questions

I am currently running NIS 2011 installed from cd with a 3 user license and have 60 days left on the subscription.

 

I am wanting to install onto a second (Windows 7)  PC that came preinstalled with Trend Titanium Internet Security.  What proceedure should I follow to replace this with NIS.  Can I get a free upgrade to NIS 2012 and how do I go about getting this on both PC's  (I am a UK user)?