Here we will show you small trick to use Windows 7 without activation for 120 days. Follow below steps to accomplish this task

Step I - Type CMD on your Windows 7 search, right click cmd and run it as a administrator as shown below

Step II - Now type the following command and hit enter as shown below
slmgr -rearm

Step III - You will be prompted to restart the computer. Once restarted the trial period will be once again reset to 30 days. You can use the above command for up to 3 times by which you can extend the trial period to 120 days without activation.