Have lectures been uploaded to the system

Answer: upload has been made and the user can enter the Moodle system and virtual classrooms

I cannot access virtual classrooms

Answer: you must install "Flash player"

Or the Instructor has not joined the class yet

I cannot hear the instructor's voice while I am inside the virtual classroom

Answer: Make sure your audio settings are set correctly

The following message appears: "could not load plug in" or "could not load shockwave" while trying to enter the virtual classroom

Answer: install "Flash Player"