Your only hope of doing this would be in a customization kit Microsoft tends to provide in a low key manner, because it's aimed more at businesses that want to put their name or some such on the browser. Think like how a lot of times you may get a new computer and it will say maybe "Internet Explorer provided by Dell" or whomever. Not sure if it will let you go and alter something like you want, but that would be your best (and quite probably only) hope. I forget the name of the program now off the top of my head, but surely someone will be along who remembers, or I've probably given you enough info to start googling for it on your own.
If it is possible, how could one change the appearance of the 'Internet Explorer cannot display the webpage' in, IE9(.0.6)? Transparant would be nice, but a plain color without text would work as well.
Tried googling it offcourse, but could only find people having problems getting the 'Internet Explorer cannot display the webpage' which isn't a problem at al for me, I just like to be it less obvious.