Quick time not playing in page ie ...

I am a teacher and I've put a bunch of QT files in a repository for an online class. I create pages in an online platform called Angel and link to the Quick Time files. Angel works best (or only seems to work) with PC's and Internet Explorer. The pages I made were displaying the quick times wonderfully until one day when all the links started breaking and I'd get this message:
"Internet Explorer has blocked this site from using an ActiveX control in an unsafe manner. As a result, this page may not display correctly."
And it doesn't. I can't get quicktime to work / link anymore.

My pc uses xp, and IE 7 (going to 8 didn't help). Any ideas about how to get Quick time working?

I have a mac, but firefox and the platform (angel) aren't playing well together either?

Help?

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