How To enable/disable USB port in windows XP ,Windows vista, Windows7 and 2000

How To enable/disable USB port in windows XP ,Windows vista, Windows7 and 2000.

It's Easy way and You can restrict USB access to Your system to avoid un-authorised use.

Step 1st: Click Start
then click on Run.
or
press win key + R

step 2nd: 
One box prompted,
then type regedit in that box , and then click OK
 

Step 3rd:
Find and Locate the following registry key:

HKEY_LOCAL_MACHINE
>SYSTEM
>CurrentControlSet
>Services
>USBSTOR
 

Step 4th:
In the right side, you have to find Start then double-click on Start.
 

Step 5th:
In the Start Value data box, type 4
click Hexadecimal (if it is not already selected), and then click OK
and now quit Registry Editor.

 

ENABLE USB PORT:


Repeat the above steps upto 4, then

In the Start Value data box, type 3 click Hexadecimal (if it is not already selected), and then click OK
and now quit Registry Editor.