I finally I managed to install successfully NetBeans but this time, I am using version 6.9 compared to the old version of 6.1.
I shall indeed be having difficulty getting used to the new version and configuring the Java business system I made with the old version. However, my laptop reformatting required me to remove all my old software. Thus, I have to reconnect everything again.
Now, that I am back to school works, I have to get used to getting oriented with the new Netbeans environment.