registration key

Hello. Sorry, my English is not advanced. I want to know how can I get registration key for Avast 6.0.1367. I downloaded Avast and I registered with some problems, but did not receive this key by email. I use this program with much success and thank you, AVAST. I know from friends that such a key is required. Please guided me how I can get It. It is posible may no longer need it?
Thank you!

Note: This post was edited by a forum moderator to clean up post of unwanted HTML codes due to OP copying and pasting text on 01/23/2012 at 9:29 AM PT