Besides, could you please answer the other questions? :wink:

Do you use the latest build (4.1.396) of avast?
Do you have avast! 4 Home or Professional? If there is really ashcmd in the error box - did you create any special scripts using the ashCmd program?
What exactly do you mean by “error message popping up so quicky that you cannot read it”? You mean that the error message disappears itself immediatelly?
Can you start e.g. ashSimpl.exe from the avast! installation folder?