First of all, we need to download and install professional partition magic to computer, and then launch the software to get its main interface. In the main interface, please choose the system partition which needs extending and click the functional button “Extend Partition”. Then, the left interface will appear. In this interface, please select the partition where free space can be taken to extend Windows partition and drag sliding button to determine how much free space to take. Then, click “OK” button to go back to main interface. In the main interface, we can see preview effect. If system partition has been extended, we should click “Apply” button to apply all changes to computer. If preview effect is undesired, we need to extend Windows partition again. In the process of extending Windows partition, users do not need to worry about data security, because professional partition magic offers all-sided data protecting measures.