I recently updated to Windows 7 64-bit from XP on my Dell Latitude D830. Now I am not able to watch dvd's because it says the video card does not support DirectX 9.0. Is there an easy way to fix this or do I have to find a new video card?
What DVD player software are you using? It might be too old to run in Windows 7 (or 64-bit) and is probably unable to properly detect the DirectX 11 that comes with Windows 7.
Both the Intel X3100 and Quadro NVS135/140 graphics are DirectX 10 hardware -- all of which would fill both the software's requirement of having at least DX9 hardware and DX9 libraries installed.
Perhaps make sure you have the latest driers installed.
Dell drivers for both nVidia and Intel : http://support.dell.com/support/downloads/driverslist.aspx?c=us&cs=04&l=en&s=bsd&ServiceTag=&SystemID=LATITUDE%20D830&os=WW1&osl=en&catid=&impid=
nVidia drivers here : http://www.nvidia.com/object/notebook_winvista_win7_x64_195.62_whql.html
What video card does the D830 have now? Could have integrated or nVidia Quadro 135M or 140M I believe.
Do you have the latest Dell drivers or just the MS ones that came with Windows? Grab what you can from Dell. Might be Vista but may be better than MS. Worth a try