Fake Norton Deleted My Real Norton???

Hi,

So to break it down, I believe I have accidentally downloaded a highly malicious file. It downloaded a 'Norton360 free 30 day trial' which i believe is fake, and has deleted my Norton antivirus program that I had paid and downloaded onto my computer only a couple of days prior (I bought it on 12/06/2015), The subscribtions was suppossed to last at least a year. Needless to say i'm fairly frustrated. I attempted to re-download the program I paid for, but I can't. I am unsure of what steps to take next. Is there anyone I can speak too about this? Any advice or help would be much appreciated.

Thanks