I have installed the Witcher 3 and it is playing beautifully. There is one minor annoying problem though. The game fails to disable the "Windows" key when it is running. I am playing the game in full screen mode. Is there a way to disable this key while in full screen mode?

Game Version 1.08.4
Windows 10 Pro
Mouse and Keyboard Control scheme

Thank you for your time and help!

I also have this problem :/ Moreover, when I'm idle for a few minutes, the windows screensaver is turned on :/

Are you running the game as a borderless window by any chance? Shouldn't happen, if you're running the game fullscreen.

@Windows Key: I think you can disable that - see here:
http://www.howtogeek.com/howto/windows-vista/map-any-key-to-any-key-on-windows-xp-vista/?PageSpeed=noscript

@ScreenSaver: Afaik the answer is no - this annoys me as well.

Just change your screensaver time to a longer period.

Modern monitors don't need screensavers. Disable it.

I know about that, but I also need little bit security / privacy. Screensaver (with password) protects my computer when I'm away. I've remapped left Win key to asterisk, and now I can bind some functionality in game to Win key.
But it's temporary solution, because left Win key is usable for me in everyday computer usage.
Nevermind...
I've found better solution: utility AutoHotkey. After installation, file AutoHotkey.ahk should be opened (it is regular text file)
Delete everything which doesn't start with semicolon, and then put this line at the end:

~LWin Up:: return

Restart/reboot.
Unfortunatey, AutoHotkey has no autostart feature, and must be launched just before gaming.
All shortcuts like Win+M, Win+E still working, but in Witcher i CAN bind something usefull to Win key and not being thrown into desktop :D