QuickTime 7.0.3 and 7.0.4 won't play Expo Keynote or other streaming video

I have been trying to watch the Mac Expo Keynote but nothing works. I click on the keynote link and a file is downloaded (qtbutton_100.mov). Clicking on this file get me to a Quicktime player window, without screen (audio only) and the title "Watch the Keynote Address." Pressing play only moves the progress arrow to the end of its range (far right) but there is no video at all.
On other sites trying to open a video stream I get a Safari Window: "Autoback.html." It's totally blank. This problem actually appeared a week or two ago but now it's impossible to watch or download any video in Quicktime.
QuickTime 7.0.4 installed now with every plugin I could find - especially new Flash and Shockwave and Windows Media.
The same was true for Quicktime 7.0.3 which I updated thinking that might solve the problem.
Does anyone else see this or know where the problem lies?
Thanks
MartyP

I tried the 7.0.1 reinstall from 7.0.4 without luck. No effect - everything was the same. I also have another strange effect I forgot to mention before; When at Apple's home page, clicking on the Quicktime tab causes the page to rapidly open and then close back to the home page. Then a second later I hear a file that was sent to my download folder (btn_launchguide.gif). That file, a logo, opens Preview but nothing else.
I'm going to look for and install QT 7.0.1 from an original package rather than the reinstall one . I'm also going to reinstall 10.3.9 on one of my volumes. there are just too many issues with Tiger (that I'm having) - much less with Panther.
Thanks for everyone's replies
MartyP

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