Download Jmeter and execute the batch file (Jmeter\\apache-jmeter-2.6\\bin\\jmeter.bat).
We get the error message in the console:
Unable to access jarfil
I'm running JMeter 2.8 (Windows 7) and received a message similar to that in the original post:
C:\>jmeter
Error: Unable to access jarfile C:\local\software\jMeter\apache-jmeter-2.8\binApacheJMeter.jar
errorlevel=1
Press any key to continue . . .
I'd created a Windows environment variable JMETER_BIN and set it to the JMeter path which I could see contained ApacheJMeter.jar (so it wasn't a question that the jar was missing).
I should have noticed at the time this portion of the error: "binApacheJMeter.jar"
When I went to the jmeter.bat file to troubleshoot, I noticed this line:
%JM_START% %JM_LAUNCH% %ARGS% %JVM_ARGS% -jar "%JMETER_BIN%ApacheJMeter.jar" %JMETER_CMD_LINE_ARGS%
and that caused me to revisit the "binApacheJMeter.jar" portion of the error.
What was happening was that the batch file was requiring a trailing slash on the end of the path in the JMETER_BIN environment variable to correctly specify the location of the .jar.
Once I corrected my environment variable, adding the trailing slash, all was wonderful.
YMMV, but this worked for me.