You mean I should do something like this:

configuration required for:
browser → WebShield → WebWasher → Internet

  1. WebShield:
    Redirected HTTP ports: 80

  2. avast4.ini:
    [WebScanner]
    UpstreamProxyHost=127.0.0.1
    UpstreamProxyPort=8080

  3. IE LAN settings: