If your PC or system is not working properly or creating an issues then reinstalling windows can be a perfect solution to enhance your system performance. It may be sound difficult but it is not like that. There are different reasons that you might want to reinstall your windows like your system is infected with virus or it is working very slowly all the time. As long as your system hardware has no problem, reinstalling window is a good option for speed up your computer performance. Here in this article we are discussing the reasons why windows slow down over the time.