Avi From Webpage Plays Sound No Video

when looking at a webpage with an embedded avi, the avi d/l's, then only sound plays.When I attempt to view the file in the temp internet files folder, it only plays sound, and properties (in media player) says audio file. When I copy the same file to another folder (somewhere outside temp int folder) and play the file, it plays the audio and video like it should (and properties in media player says audio video).What gives? I've checked in the browser settings and its set to play videos on webpages, and I've tried checking play by extension (as opposed to content) as well. The media player is only 9 (yes, I'll upgrade), but I know that's not the problem because I've looked at the same site with a different computer (but not xp) and it works fine.