Disabling/Enabling the windows key
The "scripts" below either add (disable) or remove (enable) a string registry key, Scancode Map. Restarting is required for the key to become enabled/disabled, so if you change your mind before restarting just run another one of the "scripts". It also seems that logging out and the logging in again can sometimes activate the registry key, instead of going through a full restart sequence.
Disable both/all windows key:
Run this registry script: DisableWindowsKeys.reg
Disable Left Window Key
Run this registry script: DisableLeftWindowKey.reg
Disable Right Window Key
Run this registry script: DisableRightWindowKey.reg
Enable both Windows Keys
Run this registry script (removes the "Scancode Map" key installed from the above scripts): EnableWindowsKeys.reg