Miért nem indul a City Bus Simulator 2010? (lent részletek)

Ezt írja ki mikor elindítom :

The engine was unable to create a suitable graphics context.

Please make sure your graphics hardware meets the minimum requirements.

If you are running in windowed mode for the first time and you see this message,

make sure your desktop clolor depth is set to 32-bit color.

Mit tudok csinálni ilyenkor? :/