Can we control hardware Acceleration through DirectX? is there any way to enable or disable, or modify hardware acceleration value. please reply soon .... thanx.

No i dont think so ...
I want to control or change the level of hardware acceleration that usually come by going to properties of VGA.

can we change or enable disable hardware accelaration?
I am using managed DirectX (direct3D).
acctually there are certian levels of hardware acceleration that means different at different level, i want to control this level or any thing with hardware acceleration.

Your questions or desires don't really make sense.

You control your graphics card through D3D or OpenGL and that is it.

Ok, you can disable the HW acceleration for D3D through the dx control panel or from your display properties. I don't see a reason to do this unless you are debugging your software.

The level of the hardware is something that you cannot modify, ie. if some graphics board does hardware acceleration, there is no way to really downgrade it, unless you write your custom driver or actually modify the board.

Perhaps you mean that you want to fix your software to work with certain level of hardware ? That is, that your software for example requires DX9 compliant GPU. There is no problem of creating a software vertex processing device with D3D and if that is what you want, then go for it.

Acctually i want to change this feature because my software is crashing after a long time running (8-9) hours.
this is happening on certain VGA cards (Radeon cards) which i think use come software with their drivers (Catalyst). this software also controlls Hardware acceleration or etc. by uninstalling this software we have come to know that system does not crash.

please can u help me on that all scenario.
thanx