I have tested this extensivly, so i am sure that installing team speak on any specific user account makes windows media player 10 pop up the error message "An Internal Application error has occured"

Additionally, when i try to watch any film clips online using firefox (most recent edition) i get the message "Can not create DirectShow player"

When I try to watch any film clips using windows explorer, i dont receive an error message, but only the sound (not any visual) plays

Any help would be much appreciated