What does norton mean with this?

Auto-Protect has blocked W32.Rontokbro@mm

as a security risk. Your computer is secure.

What does norton mean with this?computer virus

W32.Rontokbro@mm is a worm that wrecks havoc with your system, causing severe instability. Norton blocked it, and as a result, your computer is secure.

What does norton mean with this?free spyware remover

It blocked that virus from infecting your computer.
it means dat it has blocked W32.Rontokbro@mm. watever dat means
It blocked it from running, by blocked it would seem it stopped it from even entering your computer, if it had of got on your computer it would have said something like "Norton removed or cleaned the virus"

Always double check by scanning your computer with your Norton and an antispyware program