Thanks! Uninstalling IE9 helped solving IE9 error message!
I used Microsoft Fix it 50778 to remove IE9
This restored IE8.
Now MobileRead Creator doesn't give error after UPDATE in Guide as above in this thread.
I will describe next error in a separate message.
Originally Posted by pholy
As noted earlier in this thread, it seems that having IE9 installed is sufficient to cause problems, whether you use it or not. Since you are not using it, why not get rid of it? It's worth a try.