I reply to myself, in case it could help someone else.
- I updated Norton and Windows firewall, still not working
- I uninstalled ADE 2.0 and installed 1.7.2 from : http://helpx.adobe.com/digital-editions/kb/cant-install-digital-editio ns.html
then as soon ADE was opened I got:
E_ADEPT_IO ActivationServiceInfo Error%20#2032
- Did more researches and tested a solution found in:
http://forums.adobe.com/thread/315028
I don't understand why but it works:
- uninstall ADE
- Download ADE using IE browser and not CHROME as I did
- reinstall
--> it works
