Some functions related to system partition cannot be completed when operating system is running. In this case, you can boot to DiskGenius WinPE version.

Step 1  Click "File" menu and choose "Reboot To DiskGenius WinPE Version", as follows:

It may take several minutes to create Windows PE environment for the software.

Step 2  Click OK button and computer will restart to boot to DiskGenius WinPE version.