Opening the GPMC is also accomplishable by using the more traditional, classic Microsoft Management Console (MMC). The MMC is a general administrative console within which you snap-in one or numerous different administrative tools. To open the GPMC this way, you start by opening up the MMC. You can do this by clicking the start flag and typing MMC and pressing Enter. Or you can also type MMC from a command prompt or PowerShell prompt and open it that way as well.
Once inside the MMC, click on the File menu, and choose Add/Remove Snap-in...:
You are now presented with a wizard interface ...