my acer aspire 5920 freezes whenever i play hd videos or play games, and when i restart it the video driver gets corrupted ,so i use the basic display drivers which doesn't detect all of my VGA memory ...it only displays 250MB of memory available whenever i check.but when i install direct x 9 ,it comes back to normal displaying the approximate available memory of 1525MB but it still goes back whenever i try to play games or watch hd videos...guys plsss i need your help..