32.0.2 won't display WebM/MP4 video even when playing audio

I just downloaded/installed Firefox today to test web design for a class. This is not an upgrade but a clean install of 32.0.2. I'm running Win7 32-bit (6.1SP1)
I can not see any video in Firefox, though the files' audio routinely plays just fine. I have tested with files generated by me, and test files from the following sites:
http://camendesign.com/code/video_for_everybody/test.html
http://www.htmlandcssbook.com/code-samples/chapter-09/example.html
The player controls come up, a grey box for the video player area comes up with a play button in it, but when I push play, there is just blank/white space, and the audio. I have tested both with the VLC plugin (2.1.3.0) and without - it makes no difference. All videos play just fine for me using IE and Chrome.
Any suggestions on why I'm the only person I know who can't view these videos in FF?

You have a very old video card with very old drivers. It's so old in fact, that looks like Nvidia doesn't even have drivers available that are certified for your operating system.
* http://www.nvidia.com/Download/Find.aspx?lang=en-us
Graphics failures are listed in your system details, so this would be the first thing to try:
# Click the ≡ Menu Button and choose Options.
# Click the Advanced icon.
# Click the General tab.
# Uncheck "Use hardware acceleration when available".
# Restart Firefox.
If that doesn't help, try this:
# Click the ≡ Menu Button and choose Add-ons.
# Click Plugins.
# Set every plug-in to "Never Activate".
# Click Extensions.
# Click the Disable button next to every extension.
# Restart Firefox.
* [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]]

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