Arduino driver software does not automatically install when device is plugged in

I installed the Arduino IDE on my computer running Windows 8.1, and everything went fine until I tried to install the drivers. When I plugged in my Uno the driver installation process didn't automatically begin, even though I had disabled driver signature enforcement. My computer registered that a new device had been plugged in, but nothing happened. Does anyone know how to fix this problem or have an idea of what I did wrong? Would it be possible do download the software myself, and if so how would I go about it?

Thanks for any advice on how I can fix this.

it's documented here

For Windows 8.1 users, having Port Serial problem,

follow this, helped with this problem 100% for me..:

Credit to: beachedwhale