That is not really true; from the message it seems that bgHeaderError.png is password protected.
Anyway, try if the installer from http://forums.adobe.com/thread/909550 gives you the same error?
Actually, the scan error applies to all elements of that file. I'd only highlighted one of them so that you could see the path.
I don't get the same error on the link you gave me though.
I'll go post it on the Avast forums and see what they have to say.
Thanks for your response anyway.