Well...this is weird...and I'm not sure what to make of it.

I went to the virusscan site, clicked 'Browse' and navigated to C:...WINDOWS...Downloaded Program Files, and here is where it got weird.

First, the folder icon for "Downloaded Program Files" is different than all the others. Rather than the traditional folder, this one is tipped up on its side and more transparent/blurry.

Next, when I double-clicked "Downloaded Program Files" it popped only that much of the path into the seach field. I reloaded/retried and it did it again.

After a couple times of this, I did get the "Downloaded Program Files" to open, but the folder was empty. I tried to 'submit file' on the site but it said that the folder was empty.

Then I decided to navigate to the file to confirm that it was actually there. I went through "My Computer..." got to "WINDOWS" (I believe) and had to unhide the files. When I finally got to the "Downloaded Program Files" folder to open, it had only some files present but none for WebEx.

Then I tried to do a search (Start -> Search) and used the "atpdmod.dll" as the search string, but found nothing.

More than likely I am not doing something correctly, but I'll defer to your advice from here.