installing NIS 2012

hello guys,

 

i bought a new laptop with preinstalled norton internet security 2012. now only 30 days are left for it to expire. so i have ordered NIS 2012 online. that will be a boxed version.

 

so my question is that will i need to uninstall this version and install that or simply i can use the key provided with it.

and if some time in future i format my pc and then install norton, can i use the same product key? if not then what is the solution? 

i have registered my laptop with norton management.