When the user visits a page that contains a signed ActiveX control that has never been seen before, I'd expect IE to ask the user for permission to install the control. But sometimes IE puts up a security warning instead.

For example, consider this site, which has a test control: http://www.pcpitstop.com/testax.asp

I'd expect to get this message -- and sometimes, I do:

"The website wants to run the following add-on: 'XXX' from 'YYY'. If you trust the the website and the add-on and want to allow it to run, click here..."

But under IE8 on XP, I usually get this instead:

"To help protect your security, Internet Explorer has restricted this site from showing certain content. Click here for options..."

What's going on? Any ideas?

Thanks!