WMP10 not wont play DVD's...?

Well after all these years of using Windows Media Player to play my MP3’s, movies and DVD’s iv never had an error…until now…For some reason it wont play DVD’s and I continue getting this error msg (which is in the screenshot below)…it was playing DVD’s fine the other day and now all of a sudden its not???

The error mentions something about screen resolution and colour, for one iv used the same screen res and colouring for the last 2 years on this pc and its always played dvds, i tried changing the res & colour down but still had the same error…anyone know what I can do?