Which anti-virus can I install on my laptop which dosen't have internet connection?

[don piano]

You can install any anti-virus without an internet connection - however, it makes it difficult to keep your AV up-to-date at all times without one.

I would suggest Avast! Home Edition - it offers pretty much everything a commercial AV does. Simply install and download the latest updates manually from: http://www.avast.com/eng/updates.html

Avast: http://www.avast.com/eng/avast_4_home.html

You have to register yearly to use Avast, but it is totally free for home/personal use. Fill out registration details on the computer with internet connection at http://www.avast.com/eng/home-registration.php and rego details will be emailed to you. Write down details and enter them into the computer with Avast.