Hi,
Today I start to connect Galileo with my PC, which is Win7SP1 Enterprise, 64-bit, the same problem occur for being not able to launch arduino IDE. Thank for @marchanjo's solution to change "Format" from 'Chinese, (Traditional, Taiwan)' to 'English (United States)', then arduino IDE can launch.
Attach the msg log:
CmdLine: C:\arduino-1.5.3\arduino.exe --l4j-debug
WOW64: yes
Working dir: C:\arduino-1.5.3\.
Bundled JRE: java
Check launcher: C:\arduino-1.5.3\java\bin\javaw.exe (OK)
Add classpath: lib\pde.jar
Add classpath: lib\core.jar
Add classpath: lib\jna.jar
Add classpath: lib\ecj.jar
Add classpath: lib\RXTXcomm.jar
Add classpath: lib\commons-exec-1.1.jar
Launcher: C:\arduino-1.5.3\java\bin\javaw.exe
Launcher args: -Xms128m -Xmx128m -classpath "lib;C:\arduino-1.5.3\java\lib\tools.jar;lib\pde.jar;lib\core.jar;lib\jna.jar;lib\ecj.jar;lib\RXTXcomm.jar;lib\commons-exec-1.1.jar" processing.app.Base
Args length: 181/32768 chars
Exit code: 259