My understanding is that ;

If you are using an Nvidia graphics card and use the software from Nvidia,
then you might in combination with certain TV encoders receive an error
message when you update the software. According to an article on TheInquirer
the software does checks to make sure the encoders comply with Macrovision
requirements.

In a note to the latest drivers, Nvidia says: "The BT868 and Conexant
CX25870 TV encoders do not support Macrovision. If your graphics card is
equipped with one of these TV encoders, then it will not support DVD
playback with our 41.09 drivers and above."
http://www.theinquirer.net/?article=8425


Diver version 44.03
TV Encoder Type CX25871 [GF3TI500]
PowerDVD 3

Used to play DVD's with no problems, now all off a sudden it doesnt
Error Details
TheTV Out port of your display card is not working properly.
This copy protected disc can not be played when the TV out function is
enabled.

WMP9 gives a similar error.

Not changed, updated, upgraded anything, so what the hell happened???????
tried unistalling then reinstalling nvidia 44.03 drivers, no joy.
will try download older drivers to try, but dont really want to do that.