Installing RXTX-2.2pre1.jar on Windows 7 and Windows XP?

To troubleshoot :java.lang.UnsatisfiedLinkError: no rxtxSerial in java.library.path thrown while loading gnu.io.RXTXCommDriver

I experienced the same problem. RXTX mismatch on Windows 7 x64.

Here is how I got RXTX to work with Arduino & Processing on Windows 7 x64:
************************************************************************************************************
   and download rxtx-2.1-7-bins-r2.zip from “Binary” column.
goto C:\Users\Downloads\rxtx-2.1-7-bins-r2.zip\rxtx-2.1-7-bins-r2
   and copy RXTXcomm to
  C:\Program Files\java\jre\lib\ext
   C:\Program Files\java\jdk\lib\ext
goto C:\Users\Downloads\rxtx-2.1-7-bins-r2.zip\rxtx-2.1-7-bins-r2\Windows\i368-mingw32
   and copy both rxtxParallel.dll and rxtxSerial.dll to
  C:\Program Files\java\jre\bin
   C:\Program Files\java\jdk\bin
****************************************************************************************************************
The Result you get is:
Stable Library
=========================================
Native lib Version = RXTX-2.1-7
Java lib Version   = RXTX-2.1-7
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