Mouse right click does not work sometimes?

Let me tell you all details. So, i had my old mouse for 3-4 years, worked completely fine, until one day right clicks would some times not work. If i clicked hard it would work but even clicking hard would sometimes fail. So i thought its time to change it, so i did. New mouse, worked perfectly for 2-3 days and suddenly BAM! Same freakin problem, right click not working in games(minecraft, dota, lol, elder scrolls and so on). This cant be caused by mouse itself, its new and i did test on my bros computer, worked fine. I re-installed windows 7 ultimate 64 bit, but it didnt help:| haaaaaaaalp please

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