Windows Media Player 10 Fullscreen Help!

hey guys,
i have a really annoying problem with WMP 10
whenever i try to play a video in fullscreen the fullscreen mode just either, crashes instantly with a black screen followed by a return to normal windows media player with a small video window, or shows a still image of the video in the same size as it was before for about 5-10 seconds before returning again to the normal media player
i have searched with google to try and find a solution but there doesnt seem to be very much info about WMP
i also tried uninstalling and reinstalling but with no luck
thanks for reading this post an i hope someone will come up with a fix for me soon cos i wanna watch newcastle v southampton tonite on it!!!
all the best
Charlie