Help re-installing Norton AntiVirus.

Hello, this is my first post to this site. I purchased Norton AntiVirus during Thanksgiving week and it ran great until a spyware somehow got past it. The only thing I could think to do was restore my system to an earlier time, so I did, and then it asked me to update Norton. When I did, it just said I have no subscription left, but I should have over 300 days. I still have the email that gave me the Product Key to it, but can't find a place to download another one. (I purchased it online)

 

Can I download the same one I had, or a similar one, without paying for it again? I only had it for about a month.

 

If this is in the wrong section, I'm sorry, like I said it's my first time posting to this site.