"Avast can't corrupt the file as it isn't working with the live file"
You misquoted me David I was actually asking the question if it was possible for Avast to have been corrupted or compromised by a particular file from the KAT site.
I have since received suspect KAT URLs from another person whose Avast is still warning them of this HTML:Iframe-inf infection and I have double checked them with my re-installed copy of Avast and wouldn't you know it my copy of Avast fails to issue any warning.
So it really begs the big question "What is the difference between our two copies of Avast ?"
What do you say if he also does an Avast re-install like myself and then he gets no further warnings ?
I guess then one could effectively allude to the possibility that it had actually got into our systems and had actually become part of Avast.
There is also the possibility that Avast has has updated the virus signatures and it is no longer detected.
Avast Virus signatures have been updated automatically and this problem is still being detected by this particular copy of Avast that has not been re-installed yet.
I am not claiming re-installing that copy of Avast will have the same effect that I experienced but it does raise the big question of "What if it does ?"
Not sure why Avast are not trying to obtain a copy of this particular Avast that is still issuing these warnings to compare it to a copy that does not issue warnings ?
Surely that would be as good a starting point as any to try and pinpoint this problem ?
Thunder Bird.