2.2 Activation
2.2.1 Volume Activation
Each installation of Windows 7 must be activated. It is a legal requirement for ensuring that an instance of the operating system is legitimate. There is a 30-day initial grace period, during which you can make up your mind. If you are using Windows 7 for evaluation, testing, or software development and you need to frequently reinstall it and start afresh, you can extend the grace period up to three times by running the following command: