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Event ID: 1021 Source: Perflib

Source
Level
Description
Windows cannot open the 32-bit extensible counter DLL <DLL> in a 64-bit environment. Contact the file vendor to obtain a 64-bit version. Alternatively you can open the 32-bit extensible counter DLL by using the 32-bit version of Performance Monitor. To use this tool open the Windows folder open the Syswow64 folder and then start Perfmon.exe.
Comments
 
You can get this error if you try to monitor a 64-bit server via Performance Monitor from a 32-bit machine.

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