This article was previously published under Q174625
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When logging on to a Windows NT system, some or all users are unable to logon successfully.
The above symptom may occur if the value of any System Environment Variablecontains an equal sign (=). If Winlogon gets an error when trying to set anenvironment variable, the logon attempt will fail.
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack
Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.