Difference between Norton IS 2011 vs Norton Anti Virus

hi.

     I swear by NOrton and have 4 days before Norton AntiVirus2011 expires. I've had no virus or problems.  I purchased Norton Internet Security 2011online and when I tried to enter code it indicated that the code was for I.S. And the current product installed was Anti Virus.


Am I downgrading?  What's the real difference between the two for an advanced web surfer. I've been known to use Bit torrent.. maybe. ;)  Will I be at risk?

 

thanks

Jim