Disable USB Ports In XP

1) Click Start, and then click Run.

2) In the Open box, type regedit, and then click OK.

3) Locate, and then click the following registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\UsbStor

In the right pane, double-click Start.

In the Value data box, type 4 (to disable), click Hexadecimal (if it is not already selected), and then click OK.

4) Quit Registry Editor.

Note: In the Value data box, type 3 (to enable), click Hexadecimal (if it is not already selected), and then click OK.