When I click on video files (eg., mpeg or mov), instead of playing them, IE7
downloads the file and then gives two error messages ("Invalid character" and
then "Object expected") and then does nothing (instead of displaying the
video). If I download the video file and click on it in Windows Explorer, it
opens correctly (so I presume the file associations are OK).

Firefox has no problems on these same links. For example, when I click on
this link: http://www.weru.ksu.edu/new_weru/mul...s/dust003.mpeg
with FF2, a Quicktime logo is displayed briefly and then the video plays in
the FF browser window. That's what I expect to happen with IE7 as well.

When you click on the above link with your IE7, does it work?

I've searched around but cannot find an explanation for this. Any ideas?

I'm running IE7 on Vista Home Premium, all up to date.

Thanks for any help!