Perflib stands for Performance library. Perfdata stands for Performance
Data.
The %SystemRoot%\System32\Perflib_Perfdataxxx.dat files are created by the
System Monitor. And/or C:\Documents and Settings\Your Name Here\Local
Settings\Temp\Perflib_Perfdataxxx.dat. When you shutdown normally, the file
should be deleted.
If you have an abormal shutdown, these files can become orphaned, and
accumulate on your computer.
Under some yet to be determined circumstances, these files can become
orphaned during normal operation.
The Windows Performance tool is composed of two parts: System Monitor and
Performance Logs and Alerts. With System Monitor, you can collect and view
real-time data about memory, disk, processor, network, and other activity in
graph, histogram, or report form.
To open Performance...
Start | Run | Type: perfmon.msc | OK
You can view this by opening the Task Manager. The Performance tab displays
a dynamic overview of your computer's performance, such as CPU and various
kinds of memory usage.
Also caused by:
Rundll32.exe advapi32.dll,ProcessIdleTasks
Event ID: 1000
Event Source: LoadPerf
Perflib_Perfdataxxx.dat Files Accumulate Under %SystemRoot%\System32
http://support.microsoft.com/default.aspx?scid=kb;en-us;285798
What are the %SystemRoot%\System32\Perflib_Perfdataxxx.dat files?
http://www.jsiinc.com/SUBG/TIP3300/rh3343.htm
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Hope this helps. Let us know.
Wes
MS-MVP Windows Shell/User
In