Reintalling norton 360 without the cd (but with product key)

Hellow,

I bought norton 360 about 5 months ago and I had to format one of the PCs I used it for. I would like to ask if I can reinstall it. (I have lost the CD but I still have the product key) 

Hellow,

I bought norton 360 about 5 months ago and I had to format one of the PCs I used it for. I would like to ask if I can reinstall it. (I have lost the CD but I still have the product key)