ENABLE OR DISABLE USB PORT IN WINDOWS

Follow the steps to disable usb port in windowss
*Click Start, and then click Run.
*In the Open box, type regedit, and then click OK.
*Locate, and then click the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\UsbStor
*In the right pane, double-click Start.
*In the Value data box, type 4, click Hexadecimal (if it is not already selected), and then click OK.
*Quit Registry Editor.

To re-enable
*Click Start, and then click Run.
*In the Open box, type regedit, and then click OK.
*Locate, and then click the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\UsbStor
*In the right pane, double-click Start.
*In the Value data box, type 3, click Hexadecimal (if it is not already selected), and then click OK.
*Quit Registry Editor.

OR

start>>settings>>controlpannel>>system>>hardware>>devise manager>>look for the usb port in the list and select it then you can see an option disable or enable accordingly on the tool bar