need some help to watch DVDs, when i open Media player i keep getting the error that windows media player is unable to play DVD video, it was working when i set the system up a month ago, all i can think of thats changed is that i installed a trial version of WinDVD to kick the DVD rom into action but that has now expired but somehow enable dvd video to work when it was active, DVD Rom is a Sony CRX300E... help much appreciated on this one!