anesthetize the computer

Hey
I just bought a 20E license and I first wanted to optimalise my computer.
Avast however gave an error while trying to optimalise the computer saying “an error occured while anesthetizing the computer”, the original dutch text was “bij het verdoven van de computer is een fout opgetreden”. How can I solve this? They said I should go to http://support.avast.com for help…

Thanks in advance

Het GrimeFighter forum is hier:
https://forum.avast.com/index.php?board=63.0