Down arrow key does not work in bootcamp So I decided to use my old MacBook Air 2012 as a Windows laptop. I installed Windows 10 Anniversary using boot camp. Everything went well and I've installed a bunch of programs, Visual Studio, etc. It builds perfectly and everything works great.

Except for one thing: the down arrow key does not work!

I've installed the latest driver updates using the pre-installed apple update software. For some reason there is no boot camp control panel installed.

Not sure how to fix/debug this!
Try booting into the recovery mode (Hold CMD + R at boot) and test wether it works there, if it does then is a software issues and a full bootcamp reinstall may be required if it doesn't then its likely a hardware issue in which case a repair would be your best bet. Also the absence of BootCamp Control Panel points to it being a software issue/driver, attempt the above and if it works try a reinstall following Apples tutorial to the letter! Good luck