1. Temporary Solution
Add "--locale en:US" at the end of Netbeans startup command.
"C:Program FilesNetBeans 6.0.1in
etbeans.exe" --locale en:US
2. Permanent Solution
Go to Netbeans installation directory, for example,
C:Program FilesNetBeans 6.0.1etc
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