After doing so many surveys, it has been found that the most widely used Operating Systems are Microsoft's Windows Operating Systems. They are used more than any other Operating System now a days. Microsoft is providing the trail version of each Operating Systems to try out their Operating System. After the trial period finished, user will only able to use some of the features and many of the features will be disabled automatically as the trail period is over. Sometimes it may happen that user can't able to know all the features of particular Operating System because of lack of time for the trail period.
Here, I've provided a tutorial by which you will able to activate your Windows Operating System for 180 days. I'm providing this tutorial only for testing purpose. If you like this OS than go for it and buy it. Don't use pirated software and don't encourage people to use pirated software. Developers try hard in developing such software or OS, so buy it and support them.