Hi All!!! Finally, After facing the same problem for about a month, I found a solution!!!
In my case, the installation was crashing if a provided it with an answer file and launched it in silent mode.
So, Here is the solution:
just add the the "-j" switch and your JRE directory path as an argument for the installer!!
For Example, in my case:
java_ee_sdk-6u3-jdk7-windows.exe -j "C:\Program Files\Java\jre6"
For some reason, if lauched without this argument, the installer fails to find the
java home directory and the installation fails (on some computers...)
Have A great time everyone!