It will activate your windows for lifetime and it's safe.
Step1: Disable your windows security. Otherwise, your system may delete the file. Step2: Extract the zip file by entering the password 'tanvir'. Step3: Run the exe file. You will see the interface as shown. Just click activate. Wait a few seconds and it will automatically activate your windows. Step4: To verify your activation open Command Promt and type the command 'slmgr /xpr' and hit enter. You will see a window that says the machine is permanently activated.