Flash player starts playing video but stops, audio still plays

When I watch videos on youtube the video and audio play fine for the first few seconds. Then all of a sudden the video stops playing, but the audio continues to play. I am using Firefox 3.0.10, Windows XP SP3, Intel Celeron Processor 434MHz, 256MB of Ram. This also happend with other browsers like Google Chrome, and Internet Explorer. What can I do to correct this issue? Thanks in advance.

First, disable Java. It's a security risk and has nothing to do with the problem.
If you're using Safari, from the menu bar, select
Safari ▹ Preferences ▹ Extensions
Turn all extensions OFF and test. If the problem is resolved, turn extensions back ON and then disable them one or a few at a time until you find the culprit.
If you wish, you may be able to salvage the malfunctioning extension by uninstalling and reinstalling it. That will revert its settings to the defaults.
If there's no change, from the Safari menu bar, select
Help ▹ Installed Plug-ins
Besides the following, what plugins are listed?
iPhotoPhotocast
Java
WebKit built-in PDF

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Flash player starts playing video but stops, audio still plays

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