system
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Thanks to all ( special the avast team,and Lucas ) who helped me.
The problem in my case was that the Kerio Personal Firewall (2.1.5) is not able work with the network shield (4.5…549) at the same time. It will sometime trap to invalid pointers.
A workable solution for me is to switch the network shield off, this could be for others not a good solution. At this moment I work with a ADSL router ( for the network control), the Kerio firewall ( for app access control) and the avast as virus scanner.
For later when I have more resources is will try to look for another firewall.
henry