Lets do this.
Un-install Chrome and re-install.
To do this un-install Firefox reboot.
Then Re-install it,this time import the Bookmarks from Chrome.
Now un-install Chrome reboot.
Re-install Chrome and import the bookmarks from Firefox.
Test the video's in chrome.
Then Reset IE to Default settings.
http://support.microsoft.com/kb/923737
Reboot and test with IE
Let me know the outcome.