Display driver r300. when i use my media player 11, i will watch a video and the screen will stop

Question

when i use my media player 11, i will watch a video and the screen will stop but the sound keeps on, then at the bottom there is an error message......display driver r300 has stopped responding and has recovered, how do i fix thisWhen Im on my you tubeand go to full screen the screen will stop but the sound keeps on, then at the bottom there is an error message......display driver r300 has stopped responding and has recovered, how do i fix this