When you use a program that attempts to gain access to a performance counter that has not been installed, your computer's performance may degrade or the computer may stop responding (hang) because of a memory leak. For example, if you use the Microsoft Systems Management Server (SMS) 2.0 Healthmon tool on a computer that does not have the Microsoft Simple Network Management Protocol (SNMP) configured, the computer may hang and you may be required to restart your computer periodically.

This problem may also occur if any application, such as system management products, tries to access performance counters on the computer in question.

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This problem occurs because memory is not being deallocated correctly when an attempt is made to write data to the corresponding performance counter that is not available. It may be necessary for you to determine which performance counters your program is attempting to update to ensure their availability.

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Windows NT Server or Workstation 4.0

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:

•	http://www.microsoft.com/downloads/details.aspx?familyid=E396D059-E402-46EF-B095-A74399E25737&displaylang=en/ (http://www.microsoft.com/Windows/ServicePacks/) -or-
•	152734 (http://support.microsoft.com/kb/152734/EN-US/)how to obtain the latest windows nt 4.0 service pack

For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

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Windows NT Server 4.0, Terminal Server Edition

To 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:

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To work around this problem, install the SNMP service on your computer. To do this:

1.	Click Start, point to Settings, click Control Panel, and then double-click Network.
2.	On the Services tab, click Add, and then double-click SNMP Service.
3.	When you are prompted, type the full path to the installation files folder (for example, D:\I386), click Continue, and then click Close.
4.	Reinstall the latest Windows NT 4.0 service pack, and then restart the computer.

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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 Server version 4.0, Terminal Server Edition Service Pack 6.

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If you are using the Healthmon tool and you have already installed Windows NT 4.0 Service Pack 4 with the SMS hotfix, you may also experience this problem. For additional information about memory leaks and SNMP, please see the following article in the Microsoft Knowledge Base:

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