Whenever I load a dvd after it starts playing it gets really choppy and the video and sound skips. I don't know if it's a driver or player problem. I updated DirectX and that says their are some *.vxd files that aren't certified by Microsoft (whatever that means). The files are present on the system and DirectX seems to be able to use them because the Diag.exe test program says everything is working properly. By the way the DVD player I'm running is ATI. That might be the problem right there, but I don't know. Can anyone help or give me some pointers on this software issue.