How can I re-install Norton after re-setting my laptop to the "out of box" state

I had to back up to the "out of box" state on my laptop due to a virus last night.  I bought Norton to try and fix the problem, but couldn't get it to run.

 

I bought it yesterday.  I have my ordrer conf. number.

 

How can I get it back on my laptop?

 

Thanks!