Why is access denied to my Active Directory (AD) users and computers?

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This problem tends to present itself in many ways. Typically it's a corruption of the Windows Administrators Pack. The steps below should help you resolve this issue:

1. Try reinstalling the adminpak.msi
2. Ensure that the .msc file extension is associated with the MMC.exe (Microsoft Management Console) by right clicking on the file and selecting General > Properties > Opens with MMC.exe.