to answer all the remaining questions:

  • set a static ip @ did not solve the problem

  • i have performed a custom installation without “network shield” = same problem

below are the event when the labtop boots with AVAST installed (but i think it’s clueless):

AMLI: ACPI BIOS is attempting to write to an illegal IO port address (0x74), which lies in the 0x74 - 0x76 protected address range. This could lead to system instability. Please contact your system vendor for technical assistance.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

then:

Your computer has automatically configured the IP address for the Network Card with network address 000F6672F611. The IP address being used is 169.254.161.13.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

i think i will give up with AVAST, my goal was just to get off NAV… thinking about try some other software…