Disable USB pen Drives windows xp

How it operates is simple, we set a registry key that tells the UsbStor driver not to load on boot:
start - run type regedit. go to this path

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\UsbStor

Start = 4 (Disabled) – Don’t start the driver on boot

Start = 3 (Enabled) – Start the driver on boot