Hi, thanks to all.

Avast free antivirus 6.0.1289 definitions 111022-0

Ad-aware, Claimwin and C-Cleaner, none of which with realtime features.

Comodo firewall, of course with a real time feature, but it doesn’t cause me problems. I have it since before Avast, and for few days I could use them both without connection problems.

Those mentioned, none realtime, seldom used, they never discovered any big threat, just few suspect files.

No

No

No

Well, of course I skipped this step

I tried to do it, but it doesn’t help. Also, it prevents me internet access even when turning down Avast. To restore the connection I have to deactivate Avast, delete those LAN setting and reboot the computer. Notice that I had internet for few days with Avast, but it stopped from one moment to another, without any change/install/action. I was browsing ordinary staff (wikipedia), and suddenly no more internet, with either IE or firefox.