How to disable /enable access to USB port?

How to disable /enable access to USB port?
 Step 1:

press win key + R

then kind regedit
Step 2:

Located HKEY_LOCAL_MACHINE

 SYSTEM

 CurrentControlSet

 Services

  USBSTOR

Step 3:

in right panel choose begin double click on begin

Step 4:

To disable USB port access

type four therein box

n choose positional representation system.

click OK.

Step 5:

TO modify IT:

Follow higher than step upto step 3rd:

Now double click on START:

Type three therein box click ok

Basic of this tricks

just kind in Box

type three - to modify

type four - to Disable USB Acces