I'm interfering!
Script errors, (Javascript), are entirely out of our hands as they are web site or web page based. It is surprising how often web pages have script errors, and all that means is the Javascript is poorly written. We could say that this is because the vast majority of web sites are written by non-professionals, but the worry is that this is not entirely true. Many professionally written web pages also contain script errors.
All browsers handle script errors in different ways. While all of them simply ignore errors and move on to the next bit of web page code, some will report errors and others will not. IE is one of those that reports errors.
You found the two check boxes in IE > Tools > Internet Options then the Advanced tab, and if you haven't already done so, I would recommend ticking both those boxes, then Apply/OK
To be clear, these are;
Disable script debugging (Internet Explorer), and
Disable script debugging (Other).
Why disable Script debugging? That should get rid of the annoying messages that other browsers don't bother displaying. Also, none of us normal users know how to debug Javascript, so it is pointless telling us anyway.
In your other post you mention Incredimail and ActiveX messages. As I said in my other post to you in the other discussion, I don't know Incredimail at all and I don't understand why it is mentioning ActiveX, because ActiveX is a uniquely Internet Explorer component, or so I thought.
But I suspect you need to review your ActiveX add-ons in Incredimail and see what they are and whether they are needed. If not, disable them.
Mark