I can't play Firefox tutorial videos

It says I don't have a player with the proper format

Not related to your question but your list of plugins (in "More system details") shows you have two versions of the "Next Generation Java Plug-in for Mozilla browsers" installed: 1.6.0_31 (Java 6 Update 31) which is the current version and 1.6.0_29 (Java 6 Update 29) which is an older version that contains a security vulnerability.
I don't understand why both plugin versions would be listed (Java 6 Update 31 should normally remove Update 29) but to be safe, you should go to Windows Control Panel "Programs and Features" and uninstall the older, vulnerable Java 6 Update 29 if it's listed.
For more help with that see http://www.java.com/en/download/uninstall.jsp

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