Ok so yes that is most likely the cause of your problem because the driver is not being installed. Normally you should be able to click continue and force the installation even if the driver is not officially signed.
Ok so what graphics card do you have, and is the driver correctly installed. To check open control panel then device manage search for your diplay adapter and see if there is any warning you can double click the device to check the status of it. If there is a problem you should get the latest driver from the manufacturers website and try again also check if the driver is compatible with the OS you are using normaly it should be ok.
Remember some games will crash if you graphics card is not good enought check the graphics requirements of the game compared to your graphics card and pc setup.