ENABLE OR DISABLE ACCESSING PEN-DRIVE IN WINDOWS XP

To disable the access to USB port, in windows XP :

1. Click Start–>Run.
2. Type regedit, and then click OK.
3. Locate, and then click the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\UsbStor
4. In the right pane, double-click Start.
5. In the Value data box, type 4, click Hexadecimal (if it is not already selected), and then click Ok.
6. Quit Registry Editor.

To re-enable a disabled port:

1. Click Start–>Run.
2. Type regedit, and then click OK.
3. Locate, and then click the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\UsbStor
4. In the right pane, double-click Start.
5. In the Value data box, type 3, click Hexadecimal (if it is not already selected), and then click Ok.
6. Quit Registry Editor.