Change from Norton 360 to NIS 2011

Hi,

I currently have Norton 360 installed on 3 computers and the subscription is due to end in 2 weeks.. I have purchased the  NIS 2011 CD to replace 360  on the 3 computers. Before installing NIS 2011 do I have to uninstall 360, or will NIS 2011 overwrite 360?

 

Thanks.