ok.
I clicked on the spinning icon on tray bar --> Standart Shield --> Customize --> Blocker and uncheck the box
Then I click ok and ok again over the window tha shows the Standard Shield (I don't know how to call it)
Then I clicked on the Avast icon I have on the desktop, and after the Memory check I see the main Window of Avast. I just look at it without touching anything.
Then I close it and click again on the icon in the tray to see the Blocker setting again and here there is...the box is checked again.
Can it be because I set the security to hight?

[edit]SasoSt wrote this in the post where you explain those sttings:
Noticed one small problem.
"Default extension set" will check itself if you run Avast! Antivirus. So eveytime you use it (which is not often - im talking about main antivirus, not on-access protection or explorer extension), you have to uncheck it.
I have the same problem, it seems.
