Are you on a 32-bit system? If you are on a 32-bit version check this article here first.
Windows 7 or 8 may not be granting our dashboard permissions to launch the unreal game client. We are working on a long term fix for this, but we have a short term workaround you can use:
1. Download the direct update to DirectX from Microsoft here and run the installer:
2. Download the direct update for Microsoft Visual Studio 2010 here and run the installer:
3. Make sure you are running the most recent video and audio drivers available for your hardware on your operating system.
4. Restart your computer and launch the game!
If the above steps do not help, please try flushing your configuration files. Steps on how to do this can be found here.
If the issue persists after following the above steps and flushing your log files, we'll need you to send us your system information and logs using the directions here.