You can enable the option to disable the touchpad automatically as soon as an external mouse is connected on your Dell Studio 1555. Here’s how you do it:

1) Go to Start Menu>Control Panel>Mouse


2) In the Mouse Properties window choose the Dell Touchpad tab.

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Click on the touchpad image to open up Dell Touchpad Settings window.


3) Click on Device Select.

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4) Check the Disable Touchpad/Pointing Stick when external USB mouse is present checkbox.

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5) Done. Now when you plug in your external mouse, the touchpad will automatically get disabled.

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