Clean or replace your mouse device or change the sensitivity setting in Windows>Control Panel>Mouse.

YES, there is such a thing!

You can also open Display and adjust the video resolution settings to compensate for various levels of errors. Same with the video driver.

Reinstall a mouse driver in Device Manager or upgrading/rolling back/doing a System Restore are also options.

You can also change the mouse to see if the mouse is a Fred. Freds are easier.