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Hello, since a few days the workaround does not work for me anymore. Mp4 videos can no longer be played on youtube and other sites. Does anyone know a solution to continue to play MP4 videos in Firefox on Windows XP? Example: https://www.youtube.com/watch?v=rx-D-Ssjets Edit: I found the Error. A few days ago I put the 3GB switch on a trial basis in Boot.ini because I had problems with another program. By deleting the 3GB switch everything works again as usual.