If this helps anyone, all well and good.
The majority of trailers, although not all, would show predominantly in purple, red and yellow. A reinstall of windows failed to cure the problem. Purely by accident, I upgraded windows media player from version 9 to version 10 and now all trailers play fine.
The majority of trailers, although not all, would show predominantly in purple, red and yellow. A reinstall of windows failed to cure the problem. Purely by accident, I upgraded windows media player from version 9 to version 10 and now all trailers play fine.