The ‘Cannot delete (key name): Error while deleting key’ error occurs when the Windows access control system blocks deletion to prevent unauthorized changes. These keys are often protected by the system or owned by TrustedInstaller. In most cases, this happens because your account does not have ownership or Full Control permissions over the registry key. To fix this issue, you need to take ownership of the key and grant yourself full control permissions, allowing you to delete it. When you try to delete a registry key, Windows checks the Discretionary Access Control List (DACL) to see whether your account has the required permissions. If not, you must take ownership of the key first and then give your account Full Control permissions. Once these permissions are applied, you should be able to delete the key.

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