Code for Prompting to Intsall ActiveX?

Hello everybody. I have a flash site that I maintain very casually (just a hobby). But recently, after a fresh install of Windows on my laptop, I went to my site in IE and nothing would happen - it was just a blank, white page. I have since discovered it was because I needed to install ActiveX on my computer- after having done so, the page now works perfectly in IE.

So my question is this: how can I prompt the user to install ActiveX if they haven’t already when they go to my site?
:puzzled:
I made my site in Flash MX 2004 (super old, I know). Thanks for any help.