Topic Last Modified: 2005-11-18

The Microsoft® Exchange Server Analyzer Tool includes a performance data collection engine that is used to query performance counter objects on computers that are running Exchange 2000 Server or Exchange Server 2003. The performance data collection engine collects data from the Available Mbytes performance counter of the Memory performance object to analyze performance data. If valid data is not returned from the counter, the Exchange Server Analyzer displays a baseline message.

If valid data is not returned by the performance data collection engine, any combination of the following conditions is true:

The first two conditions may occur if certain extensible counters corrupt the registry, or if programs based on Microsoft Windows® Management Instrumentation (WMI) modify the registry.

Before you perform the procedure, verify that the Exchange Server Analyzer has appropriate permissions. For more information about the permissions that are required to run the Exchange Server Analyzer, see the Help documentation that is included with the Exchange Server Analyzer. For Help, open the Exchange Server Analyzer, and press the F1 key.

To correct this error
  1. Verify that the Memory performance object is enabled:

    1. Download and install the Extensible Performance Counter List tool (Exctrlst.exe). You can download Exctrlst.exe at Exctrlst.exe: Extensible Performance Counter List (

    2. Open Exctrlst.exe, click Sort Order, and then click Service.

    3. Locate the service for which the performance object reports and verify that the Performance Counters Enabled check box is selected.

      If the Performance Counters Enabled check box is not selected, select the check box, and then restart the service that is associated with the performance counters to verify that performance counters are operational. If the performance counters are not operational, or if the Performance Counters Enabled check box was already selected, continue to step 2.

  2. Rebuild the missing or corrupted performance counters as specified in the Microsoft Knowledge Base article 300956, "How to manually rebuild Performance Counter Library values" (

  3. If following this Knowledge Base article does not solve the issue, you will have to reinstall the Windows operating system in the Repair mode, and then apply the latest Windows service packs.