Disable USB thumb drive in windows xp

To Block USB in Windows XP

1. Click the Start button and select Run.

2. Then type regedit in the box and click OK.

3. When the Registry Editor is started, you need to expand in the left Pane HKEY_LOCAL_MACHINE>System>CurrentControlset>Services>USBSTOR

4. When you have expanded ,in the right pane , you will see an entry called “Start” where value of the start would be
0000000(3),edit the value by double mouse click and type 4 and click oK.
(4- To Block the USB
3- To UnBlock the USB)

6. Close the Registry Editor and refresh(F5), then notify Changes.If that does not work for your computer, then you will have to log out and log in to activate the changes.