Literally couldn't be simpler unless the seller actually visited my house and put it into the USB slot for me!
Running Windows 10. Plugged it into a port and instantly the Bluetooth icon appeared and worked immediately. No drivers, no fuss. I connected some wireless headphones and an Xbox One Controller to it, simultaneously.
Plugged into USB port on 6 year old desktop running Windows 10 and installed straight away with no problems. Pairs with my headphones and phone flawlessly. Activate from notifications area on task-bar - when on flashes blue and pairs with anything nearby. You can turn off when not in use. Recommended.