Thanks for your interest in this, Lano. I did use the uninstaller but as this was invoked by a generic uninstall program, I have run the Avast uninstaller again, this time directly, and reinstalled Avast. This has made no difference.
The version of Avast I am using is Avast Free Antivirus 25.1.9816a (build 25.1.9816.906). I attach a screen shot of aswhook.dll.
