Can't view .MOV files in IE 7 or IE 8

I can't view any quick time files through IE7 or IE8 when trying to access them through one of our FTP sites. When I go to our ftp site and click on a .mov, there is a 3-5 second pause then i get the Quicktime logo with a queston mark through it.

If I load the file onto my local drive, it plays just fine. If I bring up Firefox and click on the .mov file through our FTP site. It plays just fine. I'm not sure what else to look at for the possible problem. I have Quicktime ver. 7.5

Robert