Down arrow and contrast down keys no longer work properly

I've had this problem with my Yoga 2 Pro for a while now, and it's really frustrating. My down arrow key and brightness down key don't always work. Sometimes they both work fine; that's ok. However, sometimes both of them will simultaneously stop working for a while, and then out of the blue resume working just fine. It always happens as a pair; either they both work or they both don't. I'm running Windows 8.1 with all the latest drivers and BIOS. A support rep told me this was a Windows 8.1 problem; I don't quite buy that. Does anyone know what's causing this or how I can fix it? Thank you.

Ah, the joy of working with computers...:( Apparently, from my woes with the same problem, the Apple Keyboard Manager is rightfully entered into the Run directory in the Windows registry at HKLM/Microsoft/Windows/Current Version/Run.
Why it doesn't start I still have to find out, but this may be because I have Parallels Workstatio installed as well and switch back between a virtualized Windows and a Bootcamp Windows. However, after installing Bootcamp 2.1 first and then SP3 IN THE BOOTCAMP ENVIRONMENT everything seems to work, except the Energy Options taskbar icon and Apple Keyboard Manager.
Will keep you posted on any progress I make.
Apple Support, BTW, was absolutely abysmal, with them even refusing to accept the ticket at all, on the grounds that they have no knowledge about Windows. Apple, get your support fixed!

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