Video clips won't play
I have a problem which I have only just discovered, I have various video clips downloaded onto my hard drive and have previously watched DVD's and downloaded news video clips all entirely satisfactorily. I tried a few days ago to watch a news video and found that the sound was ok but the video was wishy washy and appeared like a colour negative. I have tried re-installing Realplayer and Windows Media Player 10 but this has changed nothing. When I try to play a DVD in Windows media player, I get an error message:
"Windows Media Player cannot play DVD video. Open Display in Control Panel, and then lower your screen resolution and color quality settings. To view the DVD Troubleshooter, click More Information."
I have tried every possible screen resolution and colour quality setting without the slightest improvement.
The only thing which I have done recently is to change the lcd screen from 15" to 19" but can't understand how that may have changed anything!
I am running Windows XP professional as I have always done on this machine. Any clues would be very much appreciated