Don’t have money to buy orginal windows 7 with acivation key? Here is simple windows 7 trick that increases the trial preriod from 30 days to 120 days. Before you try this trick you should check out my other blog Windows 7 Activation Key that offers free windows 7 activation keys. It may work for you.
1)Open Command prompt (cmd) , start , in search box type cmd
2) Right click on cmd and run as administrator
3)Type following command in cmd , slmgr -rearm and press enter
That is it , you can use this commend for 3 times, so that you will get 120 days of trial period(30+30+30+30=120)