You have to change the registry!
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw
The REG_DWORD entry "EmulationOnly" has to be set to 0.
and also the entry
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Direct3D\Dri vers
"SoftwareOnly" (also REG_DWORD) has to be 0 too!.