my original demo of nero expired so i downloaded n...

my original demo of nero expired so i downloaded nero 5.5.5.1 from CNET.com. When i go to run it in from the start section on desktop it says my demo has expired from the last demo i had. How do i get to the new demo and how long do these demos last? Also can i still burn MPEG-1 with nero 5.5.5.1?