When an administrator logs on to a computer running Windows Vista or Windows 7, the Local Security Authority (LSA) creates two access tokens. If you approve the action in the User Account Control dialog box, you can then complete the administrative task by using the full administrator access token. For example, if you try to edit security policies on the computer, you are prompted. If you are a member of the Administrators group and you want to perform a task that requires a full administrator access token, UAC prompts you for approval. Standard users are members of the Users group. When a member of the Administrators group logs on to a computer running Windows Vista or Windows 7 that has UAC enabled, the user runs as a standard user. Therefore, network shares that are mapped by logon scripts are shared with the standard user access token instead of with the full administrator access token. Cause This problem occurs because UAC treats members of the Administrators group as standard users.
This problem may also occur when you use the command prompt to access a network location. Symptom After you turn on User Account Control (UAC) in Windows Vista or Windows 7, programs may not be able to access some network locations.
This is a known issue under Windows 8.x and Windows 10 and this is described at Microsoft Technet: (v=ws.10).aspx After the first attempt to copy a file under administrator condition WinNc blocks access to network drives.
