WINDOWS KEY

To disable the windows key

Hive: HKEY_LOCAL_MACHINE
Key: SystemCurrentControlSetControlKeyboard Layout
Name: Scancode Map
Data Type: REG_BINARY
Value: 00000000000000000300000000005BE000005CE000000000

You will probably need to create this value, as it is not present by default. You may wish to cut and paste the value from this page to guard against typos. A reboot may be necessary for it to take effect. Of course, use caution and frequent backups whenever you edit the Registry.