Make sure you meet the requirements and specially that your video card supports DirectX 10, a tool like GPU-Z will do the trick.
www.techpowerup.com/gpuz
Verify integrity of game cache in Steam. Right-click on "Rugby Challenge 3 Demo", select "Properties" from the drop-down menu, select the tab "Local Files", click on "Verify integrity of demo cache...".
Run the configuration tool in the game install folder. "C:\Program Files (x86)\Steam\steamapps\common\Rugby Challenge 3 Demo\tools\RugbyChallenge3FanHubSettingsEditor.exe"
Run the installers for the required tools. "C:\Program Files (x86)\Steam\steamapps\common\Rugby Challenge 3 Demo\redist\directx\DXSETUP.exe", "C:\Program Files (x86)\Steam\steamapps\common\Rugby Challenge 3 Demo\redist\dotnet\dotnetfx35.exe"
If all of the above fails, contact Wicked Witch support.
http://wickedwitchsoftware.com.au/?page_id=302