If your FH opens up to the main screen then go to Options >> Video >> Rendering subsystem and change it to Direct3D9.
If you cant get to it from there then go to your FH folder found in Local Disk (C:). Open up the FH folder and find a .CFG file that says ogre. Open it up and change it to this:
Render System=Direct3D9 Rendering Subsystem
[Direct3D9 Rendering Subsystem]
Allow NVPerfHUD=No
FSAA=0
Floating-point mode=Fastest
Full Screen=No
Rendering Device=Monitor-1-Intel(R) HD Graphics
Resource Creation Policy=Create on all devices
VSync=No
VSync Interval=1
Video Mode=800 x 600 @ 32-bit colour
sRGB Gamma Conversion=No
[OpenGL Rendering Subsystem]
Colour Depth=32
Display Frequency=N/A
FSAA=0
Full Screen=No
RTT Preferred Mode=FBO
VSync=No
VSync Interval=1
Video Mode=800 x 600
sRGB Gamma Conversion=No
Save it then restart FH. If it doesn't take effect then try restarting your computer.
EDIT: If you're still having trouble, then there are plenty of solutions here. (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=10423.0)