I hope someone can help.

I have installed Internet Explorer 7 and all sites that I use for
education content video streaming are still accessible, but when I try
to stream video, I get a message about the embedded player trying to
connect and nothing else happens, and in most cases I get a message
that content cannot be reached.

Can someone hit me with a clue?
I have checked the networking settings in both the player and in
Internet Explorer 7 and nothing unusual there, and there is no
"Automatic" network setting detection checked in Internet Explorer.

Any help would be appreciated.

Thanks in advance.