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Iincomplete answer starts here ...
http://www.pcreview.co.uk/forums/thread-423449.php
Additional Information:These are NOT virus files. They are completely harmless and are only present because another application (Ad-aware, NAV, or disk monitoring software) might be creating them. You can safely ignore them as they pose absolutely no harm, other than taking up about 16 KB of drive space, which is almost insignificant these days.You can safely delete any of these, except for those that were created on the present date, as those will be locked and can't be deleted.
You can check on your systems monitoring by right clicking on My Computer, then select Manage and check for active programs under Performance Logs and Alerts.
I found a new file is created on each reboot, not just on each day. I also found that if the Java Quick Starter Service is disabled (I used Msconfig to disable it; note it is under the Services tab), the file was no longer created on my Win XP SP3 computer using Java Version 6 Upgrade 25. However, as the file was causing no harm, I reenabled the Service (and the file started to be created again).
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What is Perflib Perfdata 53a?
Perflib stands for Performance Library and Perfdata means Performance Datause ccleaner to clean out your temp files
What is Perflib perfdata 2b0?
If you don't know the answer then don't post crap like this!Answera woman called robert Not sure who the idiot is that left the "answer" above, but perflib is the subkey for storing configuration data that the performance library uses. Basically, it's the setting for collection and organization of data for performance tools, like System Monitor. Bottom line is that these files will usually be in use for the date in question, but are usually deleted in short order and shouldn't be a threat.
How do you remove Perflib Perfdata 820.dat?
Perflib and Perfdata stands for Performance Library and Performance Data of Your computer. If By any chance, you thought it is a virus, then let us assure you that it isn't.It is a log file that the System generates automatically whenever you switch on your computer and generally gets deleted once you switch it off. Though sometimes, when you shutdowns a computer by pressing the power button directly, these files get remained.We would suggest you not to delete the files.But if you still want to delete it, Here is a procedure that shall help you:Click on start>run and the type perfmon.msc and hit enter.A new window will come up showing a real-time graph of your computer's performance.on the left hand side, click on Counter Logs under System MonitorNow on the right hand side, you will see System Overview. Double Click on it.Now keep clicking the Remove button until the counters list is empty.Click on OK
