First of all, WELCOME to avast! forums Alobar !!!

So, if I understood you well, you have to dial to connect to internet. I use ADSL myself, but I’m connected through my router/firewall, so I don’t have to dial, I’m connected 24/7, whenever I turn on my computer, immediately after logging into Windows, my network connection is ready for use.

Anyway, this screenshot in attachment shows my own settings. You should go under avast! settings / UPDATE (CONNECTIONS) section and in the right pane, uncheck both options first, confirm everything so avast! can remember those settings. Restart your system and see if that helps. If not, then go back to those options one more time and put a checkmark under first option I ONLY CONNECT TO THE INTERNET USING A DIAL-UP MODEM.

Under UPDATE (Basic) section leave everything on Automatic, Virus Database, as well as Program update…

Post back if your problem is solved…

Cheers !