I've sent in the exclusion form to avast. I'm also in touch with Vectric to find out what they know on there end. I still don't understand why avast will not restore the .dll file. The virus chest now holds three copies of it. I right click on it, click restore, I get the message asking if I'm sure I want to do this. I click yes, then the screen goes blank for a second and the usual " avast wants to make changes to this computer" message comes up. I click yes and that is it. The screen goes back to normal and the .dll file is still in the chest.