Hi, I have just had to replace the graphics card in my Dell desktop. It is the ATI Radeon 5450. My problem is that when I watch a video (either online or something already on my computer) the audio is out of sync with the picture. I have tried to find a solution online with no luck. I can do a little on the computer but am no expert. I am hoping that someone more experienced than me can talk me through a fix. Thanks in advance.