In the installation folder c:program filesnovalogicbhd (can be different in some cases) there's a file called
dfv.cfg
Open that with notepad.
find the following and edit all values and set them to 1:
hw3d_res512x384 = 0
hw3d_res640x480 = 1
hw3d_res800x600 = 1
hw3d_res1024x768 = 1
hw3d_res1280x1024 = 1
hw3d_res1600x1200 = 0
hw3d_res1920x1440 = 0
hw3d_res2048x1536 = 0
then you can choose other resolutions.