HD Format and Re-installation of NIS 2010

Hello,

I have 'Norton Internet Security 2010' (3PCs 1 Year Protection) on CD.


If I format my Hard Drive:

 

1.) Can I just re-install NIS from the CD?

 

2.) Will I lose one of my activations/licences...(3PCs...I have 2 left.) even if it's the same PC?

 

Thanks.