Currently using windows XP japanese version to do most of my online and offline works. So most of my installed programs run on japanese language by default.
Installed netbean IDE 6.1 on my laptop is not an exception,
this solution will fix the problem for those who want to change english language by default not matter what language of your windows.
Permanent Solution
Go to Netbeans installation directory, for example,
C:\Program Files\NetBeans 6.0.1\etc
Open “netbeans.conf” and find netbeans default option line
netbeans_default_options=”-J-client -J-Xss2m -J-Xms32m -J-XX:PermSize=32m -J-XX:MaxPermSize=200m -J-Xverify:none -J-Dapple.laf.useScreenMenuBar=true”
Add “-J-Duser.language=en -J-Duser.region=US” to the end of this line
netbeans_default_options=”-J-client -J-Xss2m -J-Xms32m -J-XX:PermSize=32m -J-XX:MaxPermSize=200m -J-Xverify:none -J-Dapple.laf.useScreenMenuBar=true -J-Duser.language=en -J-Duser.region=US“