Hi, I had Windows 8.1 running in BootCamp so I could play GTA V. Everything was going fine. I fancied upgrading to Win 10 so I gave it a go. The update worked ok and I was using it for a few minutes before I used Apple Software Update to download whatever it downloads. Now when I boot up in Windows I see a nice lock screen but I cannot get past it as the keyboard and mouse are not recognised. My mouse does not light up. It does during booting and flashes on a off a few times but stays off once booted. If I press the power button on the back of the iMac, windows will shutdown. I am using a late 2013 iMac as per my signature. Is there a way to fix this without having to remove the partition and install win 10 fresh with bootcamp assistant?