To disable the Windows key

    Click Start, click Run, type regedt32, and then click OK.
    On the Windows menu, click HKEY_LOCAL_ MACHINE on Local Machine.
    Double-click the System\CurrentControlSet\Control folder, and then click the Keyboard Layout folder.
    On the Edit menu, click Add Value, type in Scancode Map, click REG_BINARY as the Data Type, and then click OK.
    Type 00000000000000000300000000005BE000005CE000000000 in the Data field, and then click OK.
    Close Registry Editor and restart the computer.