OK, this is what I did just now:

  1. Run Norton removal tool.Reboot.
  2. Tried to repair Avast! through Add/Remove Programs.
    Avast didn’t install the firewall.
  3. Removed Avast! w/Avast removal tool.Reboot.
  4. Downloaded a fresh copy of Avast!
  5. Installed Avast. Failed again to install the firewall
    driver.