Can you borrow a mouse, and connect it into a USB port on your computer, wait a few seconds for Windows to install the device-driver software for the mouse, and then left-click on that mouse, to see if it works?
By the way, do you have a desktop computer with an external mouse, a laptop computer with a "touch-pad", or an "all-in-one" computer with a touch-screen?
Model-number of your computer?
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