Assuming you are running Windows see if this link helps:
If it doesn't please provide the following information so that you can be helped better.
When posting a new question, please provide as much detail as possible describing your issue making sure to include the relevant hardware and software configuration.
- Issue Description: [Describe your issue in detail here]
- Hardware: [Describe the make and model of your: Graphics Card, CPU, Motherboard, RAM, PSU, Display(s), etc.]
- Software: [Describe version or release date of your: Operating System, Game/Application, Drivers, etc.]