Step-1. Go to “Start Menu -> All Programs -> Accessories“.

Right click on the “Command Prompt” and select “Run as Administrator“. If you are not the administrator, then you are prompted to enter the password, or else you can proceed to step-2.

Step-2. Now type the following command and hit Enter:
slmgr -rearm

Step-3. You will be prompted to restart the computer. Once restarted, the trial period will once again be 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.

Step-4. Now comes the actual trick by which you can extend the trial period for another 240 days. To do this, open the Registry Editor (type regedit in “Run” and hit Enter) and navigate to the following location:
HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionSoftwareProtectionPlatform

Step-5. In the right-side pane, change value of SkipRearm to 1.

Step-6. Now, you should be able to use the slmgr -rearm command for another 8 times so that you can skip the activation process for another 240 days. So you will get 120 + 240 = 360 days of free Windows 7 usage.
120 days using “slmgr -rearm” command before registry edit
+
240 days using “slmgr -rearm” command after registry edit
= 360 Days

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