@kamimatsu: It's not that, because it's not consistent, it's SOMETIMES when I click, it clicks twice causing things to happen, like me closing a window accidentally because it was under a window I wanted to close. (part 1)

@zenitix: The button in your mouse is faulty. Usually it's either dirt in the button's spring, or the spring has been slightly bent due to use. If you have small pincers and a steady hand you can easily fix either. Check Youtube for instructions.