Based on the error you described, could you answer the following questions:
What is the specific error that is being displayed?
Have you experience this issue with any other Unity based games?
Are your graphics drivers are up to date?
Is Direct X up to date?
Are you sure you have a graphics card that supports the Unity Engine (see requirements below)?
Minimum Windows Requirements for Unity based games:
OS: Windows XP SP2+
Graphics Card: DX9 (shader model 3.0) or DX11 with feature level 9.3 capabilities.
CPU: SSE2 instruction set support
Resources for checking and updating DirectX version: