Hello My avast(anti virus)do not automatically updates but i can manually update. what wrong with my

sounds like your registration key is either bad or expired... try to re-register and use the new key and see if that works.

http://www.avast.com/eng/home-registrati...

To enter your license key into avast!:

1. Right-click on the blue a-ball icon in the system tray and select "About avast!..." from the menu.

2. In the window that appears, click on the "License key" button.

3. Enter the license key into the box.

4. Click on the "OK" button.