Editor Crash on Startup

Edit: Try verifying your build before uninstalling and reinstalling. To verify: Go to the Unreal Tournament>Create tab and select the dropdown menu next to the “Create” button. Press verify. Let this run to see if some files were corrupted/missing/damaged. It will replace them if so. Then try to run the editor. If this does not work, try a full uninstall/reinstall of the editor.