Red information window

I connect to the internet by dialup 56k modem. Every time I connect to the internet I get this RED Avast informatin window in the bottom righthand corner of my computer. This red window doesn’t go away until I click on it.
In the red window it reads:
“Avast! Information
An error as occurred while attempting to update!
Click here for more information.”

This is becoming very irratating. >:(
After I click on the red window another window pops up. This window then reads:Avast! Antivirus Setup
Summary
Information about current update:
Last encountered error: Server www.iavs.net (unknown:80) is down.

Total time: 6 s
How do it get these windows from popping up. This is irratating! >:(
I use Windows 98 operating system and Zonealarm for a firewall. I gave Avast software permission to access the internet.
Can somebody help?

Please see http://www.avast.com/forum/index.php?board=2;action=display;threadid=1611;start=msg9975