Graal2k1- DirectX problem

[Correction]

I cannot get on Graal 2001 because a message pops up saying "Unsupported DirectX type or Wrong Driver!" The only way I can play is if I go into options and check the box marked "Don't use DirectX7" However, when I do this, I cannot see lighting or day/night effects. I have DirectX8 and I do not understand why Graal would not work with it. Please help me find out whats wrong or help me find a way to downgrade to DirectX7. I have tried downgrading but when I run the install for DirectX7 it says "A newer version of DirectX is already installed on this computer. Installation will not continue" Is there any way I can override that or somehow Downgrade? Please help!