Hi,
A lot of my older games do not run on my new Windows 10 desktop, with errors such as "this game requires DirectX 9.0c" etc. They can run if my screen is connected to my on-board Intel graphics motherboard (albeit not a great framerate) but come up with these errors when the screen is connected to my NVidia graphics card.
I have tried uninstalling and reinstalling the graphics drivers several times, and still get this error. Please advise what I can do.