WinKey Killer 1.7 - "Disables the Windows keys and context menu key. Great for preventing interruption of DOS or DirectX games."
Windows Key Disable - "This Program will disable the windows Key on your keyboard. This is very useful if you it when your playing games and you accidently hit the key and the game exits. This can be quite annoying so Ger Co. Created Ger's Windows Key disable"
Registry tweak for Windows XP (this or something similar might work in 9x/ME);
http://www.windows-help.net/WindowsXP/tune-151.html
