If upgrading\downgrading your Video card drivers doesn't fix the problem, changing the DX_Level will probably fix it.
Right click on your game in the Steam "Games"\"My Games" menu...
Select "Properties"... click\enter
Click on "Set Launch Options..."
Type in "-dxlevel
xx"
Click "Ok"
Click "Close"
There ya go...
Oh, but wait

The option should not really be "-dxlevel
xx"
You need to replace the
xx with one DirectX Level
lower than your current DirectX Level.
Seeing that DOD:S only supports DX8, DX9, and DX10 cards...
The only settings that your could possibly do.
"-dxlevel 80, 81, 90, 95"
That may fix your problem.