A: It depends on the operation system of your computer. If it is just Windows 7, Vista, XP, 2000, you can choose Personal edition. If it is Windows Server, you need the Professional edition. And if it is Windows 8 or you want to reset Windows Domain password, the Ultimate edition is your best choice.
A: The trial version only allows you to view all user accounts existing on the Windows, but it cannot reset the password. The full version can reset Windows account password and create new user accounts with administrative privileges.