Enable and Disable USB ports in Registry

How to enable/disable USB ports in Registry

    To disable the access to USB port,

    1. Click Start, and then click Run.

    2. In the Open box, type regedit, and then click OK.

    3. Locate, and then click the following registry

        Key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\UsbStor

    4. In the right pane, double-click Start.

    5. In the Value data box, type 4, click Hexadecimal (if it is not already selected), and     

        then click OK.

    6. Quit Registry Editor.

    To re-enable a disabled port,

    1. Click Start, and then click Run.

    2. In the Open box, type regedit, and then click OK.

    3. Locate, and then click the following registry   

        Key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\UsbStor

    4. In the right pane, double-click Start.

    5. In the Value data box, type 3, click Hexadecimal (if it is not already selected), and

        then click OK.

    6. Quit Registry Editor