Hi,
Thanks for your feedback. I cheched the Java version :
C:\Users\xxxxxxxx>java -version
java version "1.7.0_60"
Java(TM) SE Runtime Environment (build 1.7.0_60-b19)
Java HotSpot(TM) 64-Bit Server VM (build 24.60-b09, mixed mode)
It seems to be already in 64bits.
I really don't understand what is wrong.