For computers that have already used USB devices, it is necessary to disable the USB function of the computer through the registry. If you are not familiar with computers, please back up the registry before modifying it.
1. Start the Explorer and open the subdirectory Inf under the Windows folder in turn.
2. In the Inf folder, locate the file "Usbstor.pnf", right-click the file and select "Properties".
3. Click the Security tab in the Properties dialog box.
4. In the Group or User Name list, click the user or group for which you want to set the deny permission.
5. In the "User name or group? Name, click to select the Deny check box next to Full Control, and then click OK.
Note: In addition, you need to add the system account to the deny list.
6. Right-click the "Usbstor.inf" file, and then click Properties.
7. Click the Security tab.
8. In the Group or User Name list, click the user or group for which you want to set the deny permission.
9. In the "User name or group? Name, click to select the Deny check box next to Full Control, and then click OK.
1. Click Start, and then click Run.
2. In the Open box, type "regedit" and click OK.
3. Locate and click the following registry key:
HKEY _ LOCAL _ MACHINE \ SYSTEM \ current control set \ Services \ USB stor
4. In the right pane, double-click Start.
5. In the "numerical data" box, change the original numerical value from "3" to "4". (If you want to restore support for USB devices, just change the value back to "3". )
6. Exit Registry Editor.