Why do I receive an access-denied error when I try to access the Microsoft Management Console (MMC) Disk Management snap-in?

A. When you try to access the Disk Management MMC snap-in (by going to the Storage branch in the MMC under Start, Programs, Administrative Tools, Computer Management), you might receive the following error:

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"Access to Disk Manager on is denied.
You don't have access rights to the service."

You must be logged on as an Administrator to resolve this problem. A common cause is that the Distributed COM (DCOM) configuration for authentication might have been changed from Connect to Default. To resolve this situation, perform the following steps: