NIS 2011 Upgrading from 1 PC to 3 PC

I Have had a 1 Pc license for a couple of years. Next expiry Dec 1.

 

I have just taken the option to upgrade early from NIS 2010 to NIS 2011.

 

Now I wish to add NIS 2011 to a 2nd PC. On the Norton site I can not find an option to turn a 1PC license to a 3PC but I do see that a new 3PC license is offered at $49.99 where as I have recently received an automatic renewal notice for my 1PC license at $59.99!!!.

 

How do I take advantage of the $49.99 price without having to reinstall my existing product?

 

Thanks