hi all. i have a problem with my graphic card. 3 months ago a bought a graphic card ASUS N6600/256MB. last month i had some problem with it (when i start the computer -after the windows loads- on the screen apears vertical lines on the monitor, i send it to the store and they repaired it) now when i want to play a movie, it won't play, the computer begins to work very hard, everything works so slowly. when i open the TASK MANAGER it tells me that the player usage 100% of the CPU. i have put codecs, the newest driver from Nvidia is installed. i don't know what to do. plz help.