Trick to disable usb ports through registry

PC via Registry
With this trick, you can disable access to your USB(Universal Serial Bus) ports on your Windows based PC to prevent people from taking out data without permission or spreading viruses through the use of USB (pen and flash) drives.
To use this trick todisable USB ports, follow the steps given below:-
1.Click onStart.
2.Click onRun. If you cannot find RUN, type it in the search box.
3.Type "regedit" without quotes. This will launch the Registry Editor.
4.Navigate toHKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\usbstor.
5.In the work area, double click onStart.
6.In theValue Databox, enter 4.
7.Click onOK.
8.CloseRegistry Editor and refresh your desktop.
9.To re-enable access to your USB ports, enter 3 in theValue Databox inStep 6.
Try it yourself to make your PC invulnerable from data theft and malware which spread through USB ports. This works on Windows XP, Windows Vista, Windows 7 and Windows 8.
Note: This trick also disables access to your USB connected peripheral devices. So, do not use it if you have USB connected keyboard and mouse.