Extend trial limit
Due to the nature of my work with computers I reinstall operating system so often that there is no point in activating it with Microsoft center. Instead I rather use a command line tool to reset registry time counter in my operating system which gives me additional 30 days of fully functional operating system and since Windows allows to use this hack up to 3 times this gives me altogether 120 days.
To extend Windows trial period open cmd and type in “slmgr –rearm”. Wait a few seconds and see the result.Than use the same hack after 29 days and do it twice more. This way you will be able to use operating system without activating it for a full one third of a year.