Windows Media Player Plays Music but not .wmv videos

I recently got two Microsoft updates in the past few days and now .wmv files
for movies from the internet will not work. When I select on the Windows
Media Player icon on the website where I am purchasing the film to watch
online, I get the same message from internet explorer everytime. Here is
what is says:

The webpage cannot be found
HTTP 404
Most likely causes:
There might be a typing error in the address.
If you clicked on a link, it may be out of date.

What you can try:
Retype the address.

Go back to the previous page.

Go to and look for the information you want.

More information

This error (HTTP 404 Not Found) means that this program was able to connect
to the website, but the page you wanted was not found. It's possible that the
webpage is temporarily unavailable. Alternatively, the website might have
changed or removed the webpage.

I have gone to the website for fixes for Windows Vista Home Premium and
downloaded the fixes that sounded like they would work but nothing has
changed. I have no idea what was in those updates to cause this to happen.

Can anyone shed any light on how to correct this issue? Many Thanks