Disable Dell Vostro 1540 Touchpad
Your problem could be that you don't have the driver installed.
Go to the dell site and then search for the Alps Alps TouchPad driver for Vostro 1540. Downlond and install. Restart your laptop and you should see an icon in the icon tray for the touchpad, you can click on that to disable it or use the shortcut key fn + f3.
Hope that helps.
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