iMac Bluetooth Keyboard Not Working On Windows 8 :/

Well I've had an iMac for about 2 years already and my keyboard and mouse have been working flawlessly! Oh and I only use Windows 7 on Boot Camp and I've had no problems what so ever UNTIL I upgraded to Windows 8 about a week ago and that's when the problem starts. When I play games on Steam my keys on my keyboard work flawlessly like always but when it comes to typing words say like in the Internet or ANYTHING other then my games it DOESN'T WORK! Please if you have the same problem or know how to fix it please tell me. Thanks in advance! :)