lately my mouse is acting really weird. im not exactly sure what caused this problem but when i use my mouse, only half of the clicks work. that means when i click my mouse 10 times only 5 of those clicks actually register. this problem affect my left, right and scroll button. does anyone know if this is a hardware problem or a virus? if so does anyone know how to fix it?

any help would be great, playing games like this is pissing me off...