@mouser: It took me quite a time to find out that I had to run the setup as admin. As my PC-dealer told me I´d have all possible rights on my private PC that didn´t occur to me. Anyway, there is no problem anymore. Whether to decide if this is a case of "problem solved" or "problem vanished" I don´t know. And the autostart-option takes some seconds before it is recognizable. That is i have to try some screenshots before I hear the meantime familiar click sound. :)
@Kodezwerg: Dein Hinweis "Your Windows Admin Account may differ from Logon Account" war eigentlich goldrichtig. Ich habs nur nicht kapiert, weil mein Händler mir sagte, ich hätte alle Rechte. Ja, es gibt einen Unterschied zwischen Window Account und Logon Account. Bedauerlicherweise weisen weder Acronis noch Avast auf sowas hin. :)

Helmut Weber from a village near Landsberg, Germany. Male, 68 years old, 2004 til 2008 MS MVP for Word VBA, enjoying GAT online soon on 4K-equipment and enjoying Win 10 as well which works perfectly for me. Discovered this great side only last year when searching for a screenshot utility and found it. Almost no idea about coding, but interested nevertheless. At the moment searching for a slot to place a software request to randomize filenames. (Lots of solutions on the net, but nothing is satisfying.) In earlier years taxi-driver, linguist, journalist.