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When you try to use Windows Explorer after applying Windows NT 4.0 Service Pack 5, Windows Explorer may not start, and you may receive the following error message:
This operation has been cancelled due to restrictions in effect on this computer. Please contact your system administrator.
This problem can occur because of an update made to the Shell32.dll file by Service Pack 5 that permits you to hide the system drive for the default user or a specific user.
Windows NT Server 4.0, Terminal Server EditionTo resolve this problem, obtain the latest service pack for Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/152734/EN-US/ )How to Obtain the Latest Windows NT 4.0 Service Pack
Windows NT 4.0Microsoft has confirmed that this is a problem in Windows NT 4.0.
Windows NT Server 4.0, Terminal Server EditionMicrosoft has confirmed that this is a problem in Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT Server 4.0, Terminal Server Edition Service Pack 6.
For additional information about the Shell32.dll update, please click the article number below to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/219392/EN-US/ )System Drive Cannot be Hidden in Windows NT Explorer View
Article ID: 236387 - Last Review: October 26, 2013 - Revision: 3.0