Norton Internet Security 2010

Hi,

 

I have tried to load a second license onto my partner's pc but the product has not activated and does not offer activation option. My Norton Account shows I have used 2 of my 3 licenses but although the product is running fine on my pc, I cannot get it to activate on the other - I have tried to uninstall and re install but to no avail

 

Please can someone offer a suggestion on how to get this activated?

 

Thanks