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Users who have an optical-mechanical mouse (the most common mouse for desktop computers) are likely experiencing erratic behavior because the mouse is not clean or is dirty. If you've cleaned the mouse and continue to encounter issues and this mouse has worked in the past fine unfortunately your mouse is likely defective. One additional test that can be done to help determine if this is the case or not is to connect the mouse to another computer. Otherwise, we suggest replacing the mouse.

If you're running any version of Microsoft Windows and are encountering issues with the mouse wheel, first attempt to adjust the mouse settings through the Mouse Properties window. This window can be accessed by opening the Control Panel and double-clicking the Mouse icon.

The keys on a keyboard are only clipped on, with a knife or other thin object, carefully pop the keys off, this will allow you to clean under the keys as well as clean the keys themselves (make sure you remember where they went!).