Wolfeye,

There are other threads on Updating problems on the forum.
Usually it is a corrupted server.def file, but I personally have had conflict exist between Avast and my firewall.

Are you operating behind a firewall? If so, which one?
What is your OS?
IF you use IE, try putting the Avast server site address into your trusted zone.

Make sure your default iin the Main interface is set to allow automatic updates.

Right now, I can’t think of anything else you can try.
But do take a look at the other threads on this subject.

Good Luck