Re-activate my NIS 2010/ Installed new hard drive

How do I go about re-activating my NIS2010, since I  installed it on a hard drive that went bad and now have installed a new hard drive, I don't want to waste a year's worth of protection ?  (Also, I'm afraid that I ditched the CD with the code on it, after installing it, thinking I would not need it.)

 

Thanks