For @ram0506 and others getting the fatal error message: as strange as this sounds, that is expected.
You will have to dismiss the various error messages a number of times (>10) over perhaps 2-5 minutes. It's extremely strange, but if you keep dismissing the errors, DCS will eventually load.
If you open task manager in you will be able to see that DCS.exe is running, despite the application window not being visible.