My Game won't start

Each time i start Rust the game won’t work ( then the game crashes after about 30 seconds. I Have tried changing the resolution, windowed or full screen and the quality of the game but nothing works, can you please help me fix this. Thanks
If needed my Computers Specs are: Operating System: Windows 7 Home Premium 64-bit, Processor: Intel® Core™ i7-2630QM, RAM: 16gb, Graphics: NVIDIA GeForce GT 555M