How to disable or enable USB Port in Windows 7 ?

Step1: In Windows 7  press Windows key+R and type as “regedit

Step 2: It will open the Registry Editor of  your Windows 7

Step 3: After opening Registry edit browse the following path in reght side bar of registry editor
The Path to go: “HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesUSBSTOR”

Step4: Then right click the registry “Start” which is rectangled in red color in the below screenshot of registry editor

Step:5 Right Click “Start” and Click modify
To enable USB ports: change the value from “4? to “3?
To disable USB ports: change the Value for “3? to “4?
finaly restart your system.