Hi,
Maybe you have a warning
http://jmeter.apache.org/changes.html#Known%20bugs===========================================
Note that under some windows systems you may have this WARNING:
java.util.prefs.WindowsPreferences
WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0
x80000002. Windows RegCreateKeyEx(...) returned error code 5.
The fix is to run JMeter as Administrator, it will create the registry key for you, then you can restart JMeter as a normal user and you won't have the warning anymore.
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Regards.
Vincent D.