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1. Disable USB Devices:

Disabling USB ports can be a smart idea to add security to the computer. 
This can be really handy if the computer is on a public place where
 the chances of virus and other malware infection is really high. 
You can easily disable access to USB ports with the following registry hack:
  1.  Open the Registry Editor (Start -> Run -> Type regedit and hit Enter)
  2. In the registry, navigate to the following key:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\UsbStor
  3. In the right-side pane, double-click on “Start”.
  4. In the “Value data” field enter 4 and click on “OK”.
  5. Close the Registry Editor and reboot.

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