How do I install Arduino drivers? I need to install my Arduino drivers, but Windows 8.1 doesn't seem to like Arduino, and it greys out the update driver button. Therefore I can't select the drivers from the drivers folder in my Arduino IDE folder.

There are drivers that need to be installed. But Windows 8.1 greys out the update driver software button. Also, it refers to Arduino Uno as an unknown device. How do I install the Arduino drivers and make Windows let me install the drivers?
The IDE package usually ships with the driver(at-least the latest one). 
Go to Program Files in C: and find the Arduino folder and you should find a folder named Drivers. Inside you will find an application named dpinst-x86. Run it and you should be good to go!